61072786657 has 2 divisors, whose sum is σ = 61072786658. Its totient is φ = 61072786656.

The previous prime is 61072786639. The next prime is 61072786711. The reversal of 61072786657 is 75668727016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40826627136 + 20246159521 = 202056^2 + 142289^2 .

It is a cyclic number.

It is not a de Polignac number, because 61072786657 - 2⁷ = 61072786529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61072786598 and 61072786607.

It is not a weakly prime, because it can be changed into another prime (61072786057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30536393328 + 30536393329.

It is an arithmetic number, because the mean of its divisors is an integer number (30536393329).

Almost surely, 2^61072786657 is an apocalyptic number.

It is an amenable number.

61072786657 is a deficient number, since it is larger than the sum of its proper divisors (1).

61072786657 is an equidigital number, since it uses as much as digits as its factorization.

61072786657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 61072786657 in words is "sixty-one billion, seventy-two million, seven hundred eighty-six thousand, six hundred fifty-seven".