61556071505707 has 2 divisors, whose sum is σ = 61556071505708. Its totient is φ = 61556071505706.

The previous prime is 61556071505683. The next prime is 61556071505711. The reversal of 61556071505707 is 70750517065516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61556071505707 - 2²⁷ = 61555937287979 is a prime.

It is a super-3 number, since 3×61556071505707³ (a number of 42 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (61556071505107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778035752853 + 30778035752854.

It is an arithmetic number, because the mean of its divisors is an integer number (30778035752854).

Almost surely, 2^{61556071505707} is an apocalyptic number.

61556071505707 is a deficient number, since it is larger than the sum of its proper divisors (1).

61556071505707 is an equidigital number, since it uses as much as digits as its factorization.

61556071505707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7717500, while the sum is 55.

The spelling of 61556071505707 in words is "sixty-one trillion, five hundred fifty-six billion, seventy-one million, five hundred five thousand, seven hundred seven".