16561561060 has 24 divisors (see below), whose sum is σ = 37941031296. Its totient is φ = 6022385760.

The previous prime is 16561561057. The next prime is 16561561063. The reversal of 16561561060 is 6016516561.

It is an interprime number because it is at equal distance from previous prime (16561561057) and next prime (16561561063).

It is not an unprimeable number, because it can be changed into a prime (16561561063) 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, 37639692 + ... + 37640131.

It is an arithmetic number, because the mean of its divisors is an integer number (1580876304).

Almost surely, 2^16561561060 is an apocalyptic number.

16561561060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16561561060 is an abundant number, since it is smaller than the sum of its proper divisors (21379470236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16561561060 is a wasteful number, since it uses less digits than its factorization.

16561561060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75279843 (or 75279841 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 16561561060 in words is "sixteen billion, five hundred sixty-one million, five hundred sixty-one thousand, sixty".