27561561492 has 12 divisors (see below), whose sum is σ = 64310310176. Its totient is φ = 9187187160.

The previous prime is 27561561451. The next prime is 27561561637. The reversal of 27561561492 is 29416516572.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148398384 + ... + 1148398407.

Almost surely, 2^27561561492 is an apocalyptic number.

It is an amenable number.

27561561492 is an abundant number, since it is smaller than the sum of its proper divisors (36748748684).

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

27561561492 is a wasteful number, since it uses less digits than its factorization.

27561561492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2296796798 (or 2296796796 counting only the distinct ones).

The product of its digits is 907200, while the sum is 48.

The spelling of 27561561492 in words is "twenty-seven billion, five hundred sixty-one million, five hundred sixty-one thousand, four hundred ninety-two".