27561413961 has 12 divisors (see below), whose sum is σ = 40657972992. Its totient is φ = 17983333656.

The previous prime is 27561413953. The next prime is 27561413993. The reversal of 27561413961 is 16931416572.

27561413961 is a `hidden beast` number, since 27 + 5 + 614 + 1 + 3 + 9 + 6 + 1 = 666.

It is not a de Polignac number, because 27561413961 - 2³ = 27561413953 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27561413911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32578081 + ... + 32578926.

It is an arithmetic number, because the mean of its divisors is an integer number (3388164416).

Almost surely, 2^27561413961 is an apocalyptic number.

It is an amenable number.

27561413961 is a deficient number, since it is larger than the sum of its proper divisors (13096559031).

27561413961 is a wasteful number, since it uses less digits than its factorization.

27561413961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65157060 (or 65157057 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 27561413961 in words is "twenty-seven billion, five hundred sixty-one million, four hundred thirteen thousand, nine hundred sixty-one".