61561510587 has 12 divisors (see below), whose sum is σ = 88938571800. Its totient is φ = 41033442528.

The previous prime is 61561510523. The next prime is 61561510589. The reversal of 61561510587 is 78501516516.

It is a happy number.

61561510587 is a `hidden beast` number, since 6 + 1 + 5 + 61 + 5 + 1 + 0 + 587 = 666.

It is not a de Polignac number, because 61561510587 - 2⁶ = 61561510523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61561510589) 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, 578613 + ... + 676694.

It is an arithmetic number, because the mean of its divisors is an integer number (7411547650).

Almost surely, 2^61561510587 is an apocalyptic number.

61561510587 is a deficient number, since it is larger than the sum of its proper divisors (27377061213).

61561510587 is a wasteful number, since it uses less digits than its factorization.

61561510587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260762 (or 1260759 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 45.

The spelling of 61561510587 in words is "sixty-one billion, five hundred sixty-one million, five hundred ten thousand, five hundred eighty-seven".