15552121561 has 8 divisors (see below), whose sum is σ = 15572404224. Its totient is φ = 15531855360.

The previous prime is 15552121549. The next prime is 15552121567. The reversal of 15552121561 is 16512125551.

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 15552121561 - 2¹⁵ = 15552088793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15552121567) 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, 3468441 + ... + 3472921.

It is an arithmetic number, because the mean of its divisors is an integer number (1946550528).

Almost surely, 2^15552121561 is an apocalyptic number.

It is an amenable number.

15552121561 is a deficient number, since it is larger than the sum of its proper divisors (20282663).

15552121561 is a wasteful number, since it uses less digits than its factorization.

15552121561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231.

The product of its digits is 15000, while the sum is 34.

The spelling of 15552121561 in words is "fifteen billion, five hundred fifty-two million, one hundred twenty-one thousand, five hundred sixty-one".