61656500987 has 2 divisors, whose sum is σ = 61656500988. Its totient is φ = 61656500986.

The previous prime is 61656500909. The next prime is 61656501041. The reversal of 61656500987 is 78900565616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61656500987 - 2²⁴ = 61639723771 is a prime.

It is a super-2 number, since 2×61656500987² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61656500287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30828250493 + 30828250494.

It is an arithmetic number, because the mean of its divisors is an integer number (30828250494).

Almost surely, 2^61656500987 is an apocalyptic number.

61656500987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61656500987 is an equidigital number, since it uses as much as digits as its factorization.

61656500987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 61656500987 in words is "sixty-one billion, six hundred fifty-six million, five hundred thousand, nine hundred eighty-seven".