15561155061 has 12 divisors (see below), whose sum is σ = 22999950688. Its totient is φ = 10132844904.

The previous prime is 15561155053. The next prime is 15561155087. The reversal of 15561155061 is 16055116551.

It is a happy number.

It is not a de Polignac number, because 15561155061 - 2³ = 15561155053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561155161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20104465 + ... + 20105238.

Almost surely, 2^15561155061 is an apocalyptic number.

It is an amenable number.

15561155061 is a deficient number, since it is larger than the sum of its proper divisors (7438795627).

15561155061 is a wasteful number, since it uses less digits than its factorization.

15561155061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40209752 (or 40209749 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 15561155061 in words is "fifteen billion, five hundred sixty-one million, one hundred fifty-five thousand, sixty-one".