61357444957 has 2 divisors, whose sum is σ = 61357444958. Its totient is φ = 61357444956.

The previous prime is 61357444943. The next prime is 61357445011. The reversal of 61357444957 is 75944475316.

61357444957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48264135481 + 13093309476 = 219691^2 + 114426^2 .

It is a cyclic number.

It is not a de Polignac number, because 61357444957 - 2⁷ = 61357444829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61357444898 and 61357444907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61357444657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30678722478 + 30678722479.

It is an arithmetic number, because the mean of its divisors is an integer number (30678722479).

Almost surely, 2^61357444957 is an apocalyptic number.

It is an amenable number.

61357444957 is a deficient number, since it is larger than the sum of its proper divisors (1).

61357444957 is an equidigital number, since it uses as much as digits as its factorization.

61357444957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 55.

The spelling of 61357444957 in words is "sixty-one billion, three hundred fifty-seven million, four hundred forty-four thousand, nine hundred fifty-seven".