50615561657 has 2 divisors, whose sum is σ = 50615561658. Its totient is φ = 50615561656.

The previous prime is 50615561653. The next prime is 50615561683. The reversal of 50615561657 is 75616551605.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47619531961 + 2996029696 = 218219^2 + 54736^2 .

It is a cyclic number.

It is not a de Polignac number, because 50615561657 - 2² = 50615561653 is a prime.

It is not a weakly prime, because it can be changed into another prime (50615561653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25307780828 + 25307780829.

It is an arithmetic number, because the mean of its divisors is an integer number (25307780829).

Almost surely, 2^50615561657 is an apocalyptic number.

It is an amenable number.

50615561657 is a deficient number, since it is larger than the sum of its proper divisors (1).

50615561657 is an equidigital number, since it uses as much as digits as its factorization.

50615561657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945000, while the sum is 47.

The spelling of 50615561657 in words is "fifty billion, six hundred fifteen million, five hundred sixty-one thousand, six hundred fifty-seven".