61475777257 has 2 divisors, whose sum is σ = 61475777258. Its totient is φ = 61475777256.

The previous prime is 61475777249. The next prime is 61475777269. The reversal of 61475777257 is 75277757416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61395423961 + 80353296 = 247781^2 + 8964^2 .

It is a cyclic number.

It is not a de Polignac number, because 61475777257 - 2³ = 61475777249 is a prime.

It is not a weakly prime, because it can be changed into another prime (61475777227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30737888628 + 30737888629.

It is an arithmetic number, because the mean of its divisors is an integer number (30737888629).

Almost surely, 2^61475777257 is an apocalyptic number.

It is an amenable number.

61475777257 is a deficient number, since it is larger than the sum of its proper divisors (1).

61475777257 is an equidigital number, since it uses as much as digits as its factorization.

61475777257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20168400, while the sum is 58.

The spelling of 61475777257 in words is "sixty-one billion, four hundred seventy-five million, seven hundred seventy-seven thousand, two hundred fifty-seven".