2451246661 has 4 divisors (see below), whose sum is σ = 2497496652. Its totient is φ = 2404996672.

The previous prime is 2451246647. The next prime is 2451246683. The reversal of 2451246661 is 1666421542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1666421542 = 2 ⋅833210771.

It can be written as a sum of positive squares in 2 ways, for example, as 1763496036 + 687750625 = 41994^2 + 26225^2 .

It is a cyclic number.

It is not a de Polignac number, because 2451246661 - 2⁷ = 2451246533 is a prime.

It is a super-2 number, since 2×2451246661² = 12017220386127297842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2451246661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2451246641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23124916 + ... + 23125021.

It is an arithmetic number, because the mean of its divisors is an integer number (624374163).

Almost surely, 2^2451246661 is an apocalyptic number.

It is an amenable number.

2451246661 is a deficient number, since it is larger than the sum of its proper divisors (46249991).

2451246661 is an equidigital number, since it uses as much as digits as its factorization.

2451246661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46249990.

The product of its digits is 69120, while the sum is 37.

The square root of 2451246661 is about 49510.0662592972. The cubic root of 2451246661 is about 1348.3283673581.

The spelling of 2451246661 in words is "two billion, four hundred fifty-one million, two hundred forty-six thousand, six hundred sixty-one".