2451356645 has 4 divisors (see below), whose sum is σ = 2941627980. Its totient is φ = 1961085312.

The previous prime is 2451356639. The next prime is 2451356653. The reversal of 2451356645 is 5466531542.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1681738081 + 769618564 = 41009^2 + 27742^2 .

It is a cyclic number.

It is not a de Polignac number, because 2451356645 - 2⁸ = 2451356389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245135660 + ... + 245135669.

It is an arithmetic number, because the mean of its divisors is an integer number (735406995).

Almost surely, 2^2451356645 is an apocalyptic number.

It is an amenable number.

2451356645 is a deficient number, since it is larger than the sum of its proper divisors (490271335).

2451356645 is an equidigital number, since it uses as much as digits as its factorization.

2451356645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490271334.

The product of its digits is 432000, while the sum is 41.

The square root of 2451356645 is about 49511.1769704579. The cubic root of 2451356645 is about 1348.3485329242.

The spelling of 2451356645 in words is "two billion, four hundred fifty-one million, three hundred fifty-six thousand, six hundred forty-five".