61609064987 has 2 divisors, whose sum is σ = 61609064988. Its totient is φ = 61609064986.

The previous prime is 61609064981. The next prime is 61609065031. The reversal of 61609064987 is 78946090616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61609064987 - 2⁴ = 61609064971 is a prime.

It is not a weakly prime, because it can be changed into another prime (61609064981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30804532493 + 30804532494.

It is an arithmetic number, because the mean of its divisors is an integer number (30804532494).

Almost surely, 2^61609064987 is an apocalyptic number.

61609064987 is a deficient number, since it is larger than the sum of its proper divisors (1).

61609064987 is an equidigital number, since it uses as much as digits as its factorization.

61609064987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 61609064987 in words is "sixty-one billion, six hundred nine million, sixty-four thousand, nine hundred eighty-seven".