15640504125261 has 8 divisors (see below), whose sum is σ = 20867520740160. Its totient is φ = 10420245130272.

The previous prime is 15640504125167. The next prime is 15640504125271. The reversal of 15640504125261 is 16252140504651.

It is a happy number.

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

It is not a de Polignac number, because 15640504125261 - 2⁷ = 15640504125133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15640504125271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1689399576 + ... + 1689408833.

It is an arithmetic number, because the mean of its divisors is an integer number (2608440092520).

Almost surely, 2^{15640504125261} is an apocalyptic number.

It is an amenable number.

15640504125261 is a deficient number, since it is larger than the sum of its proper divisors (5227016614899).

15640504125261 is a wasteful number, since it uses less digits than its factorization.

15640504125261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378809955.

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 15640504125261 in words is "fifteen trillion, six hundred forty billion, five hundred four million, one hundred twenty-five thousand, two hundred sixty-one".