61564437552 has 40 divisors (see below), whose sum is σ = 159742115136. Its totient is φ = 20431072576.

The previous prime is 61564437541. The next prime is 61564437563. The reversal of 61564437552 is 25573446516.

It is an interprime number because it is at equal distance from previous prime (61564437541) and next prime (61564437563).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2814198 + ... + 2835989.

Almost surely, 2^61564437552 is an apocalyptic number.

It is an amenable number.

61564437552 is an abundant number, since it is smaller than the sum of its proper divisors (98177677584).

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

61564437552 is a wasteful number, since it uses less digits than its factorization.

61564437552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650425 (or 5650419 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 48.

The spelling of 61564437552 in words is "sixty-one billion, five hundred sixty-four million, four hundred thirty-seven thousand, five hundred fifty-two".