61339830557 has 2 divisors, whose sum is σ = 61339830558. Its totient is φ = 61339830556.

The previous prime is 61339830521. The next prime is 61339830619. The reversal of 61339830557 is 75503893316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45559194916 + 15780635641 = 213446^2 + 125621^2 .

It is a cyclic number.

It is not a de Polignac number, because 61339830557 - 2⁸ = 61339830301 is a prime.

It is a super-2 number, since 2×61339830557² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61339838557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30669915278 + 30669915279.

It is an arithmetic number, because the mean of its divisors is an integer number (30669915279).

Almost surely, 2^61339830557 is an apocalyptic number.

It is an amenable number.

61339830557 is a deficient number, since it is larger than the sum of its proper divisors (1).

61339830557 is an equidigital number, since it uses as much as digits as its factorization.

61339830557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 61339830557 in words is "sixty-one billion, three hundred thirty-nine million, eight hundred thirty thousand, five hundred fifty-seven".