2661495649 has 8 divisors (see below), whose sum is σ = 2736131328. Its totient is φ = 2587610400.

The previous prime is 2661495643. The next prime is 2661495659. The reversal of 2661495649 is 9465941662.

2661495649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2661495649 - 2²⁹ = 2124624737 is a prime.

It is a super-3 number, since 3×2661495649³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2661495596 and 2661495605.

It is not an unprimeable number, because it can be changed into a prime (2661495643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180412 + ... + 194605.

It is an arithmetic number, because the mean of its divisors is an integer number (342016416).

Almost surely, 2^2661495649 is an apocalyptic number.

It is an amenable number.

2661495649 is a deficient number, since it is larger than the sum of its proper divisors (74635679).

2661495649 is a wasteful number, since it uses less digits than its factorization.

2661495649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375215.

The product of its digits is 2799360, while the sum is 52.

The square root of 2661495649 is about 51589.6854904156. The cubic root of 2661495649 is about 1385.8256228490.

The spelling of 2661495649 in words is "two billion, six hundred sixty-one million, four hundred ninety-five thousand, six hundred forty-nine".