61557389401 has 2 divisors, whose sum is σ = 61557389402. Its totient is φ = 61557389400.

The previous prime is 61557389389. The next prime is 61557389441. The reversal of 61557389401 is 10498375516.

61557389401 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., 53233564176 + 8323825225 = 230724^2 + 91235^2 .

It is a cyclic number.

It is not a de Polignac number, because 61557389401 - 2²⁷ = 61423171673 is a prime.

It is not a weakly prime, because it can be changed into another prime (61557389441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30778694700 + 30778694701.

It is an arithmetic number, because the mean of its divisors is an integer number (30778694701).

Almost surely, 2^61557389401 is an apocalyptic number.

It is an amenable number.

61557389401 is a deficient number, since it is larger than the sum of its proper divisors (1).

61557389401 is an equidigital number, since it uses as much as digits as its factorization.

61557389401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 49.

The spelling of 61557389401 in words is "sixty-one billion, five hundred fifty-seven million, three hundred eighty-nine thousand, four hundred one".