15815251824961 has 8 divisors (see below), whose sum is σ = 15879271533824. Its totient is φ = 15751289408400.

The previous prime is 15815251824947. The next prime is 15815251824973. The reversal of 15815251824961 is 16942815251851.

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 15815251824961 - 2¹¹ = 15815251822913 is a prime.

It is a super-4 number, since 4×15815251824961⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15815251824896 and 15815251824905.

It is not an unprimeable number, because it can be changed into a prime (15815251824461) 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, 13769826 + ... + 14874091.

It is an arithmetic number, because the mean of its divisors is an integer number (1984908941728).

Almost surely, 2^{15815251824961} is an apocalyptic number.

It is an amenable number.

15815251824961 is a deficient number, since it is larger than the sum of its proper divisors (64019708863).

15815251824961 is a wasteful number, since it uses less digits than its factorization.

15815251824961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28646151.

The product of its digits is 6912000, while the sum is 58.

The spelling of 15815251824961 in words is "fifteen trillion, eight hundred fifteen billion, two hundred fifty-one million, eight hundred twenty-four thousand, nine hundred sixty-one".