61710538961 has 2 divisors, whose sum is σ = 61710538962. Its totient is φ = 61710538960.

The previous prime is 61710538921. The next prime is 61710538987. The reversal of 61710538961 is 16983501716.

61710538961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61049020561 + 661518400 = 247081^2 + 25720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61710538961 is a prime.

It is not a weakly prime, because it can be changed into another prime (61710538921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30855269480 + 30855269481.

It is an arithmetic number, because the mean of its divisors is an integer number (30855269481).

Almost surely, 2^61710538961 is an apocalyptic number.

It is an amenable number.

61710538961 is a deficient number, since it is larger than the sum of its proper divisors (1).

61710538961 is an equidigital number, since it uses as much as digits as its factorization.

61710538961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 61710538961 in words is "sixty-one billion, seven hundred ten million, five hundred thirty-eight thousand, nine hundred sixty-one".