15534261561 has 64 divisors (see below), whose sum is σ = 25747545600. Its totient is φ = 8112199680.

The previous prime is 15534261553. The next prime is 15534261629. The reversal of 15534261561 is 16516243551.

It is not a de Polignac number, because 15534261561 - 2³ = 15534261553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (15534261161) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21192351 + ... + 21193083.

It is an arithmetic number, because the mean of its divisors is an integer number (402305400).

Almost surely, 2^15534261561 is an apocalyptic number.

It is an amenable number.

15534261561 is a deficient number, since it is larger than the sum of its proper divisors (10213284039).

15534261561 is a wasteful number, since it uses less digits than its factorization.

15534261561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426.

The product of its digits is 108000, while the sum is 39.

The spelling of 15534261561 in words is "fifteen billion, five hundred thirty-four million, two hundred sixty-one thousand, five hundred sixty-one".