61553408399731 has 2 divisors, whose sum is σ = 61553408399732. Its totient is φ = 61553408399730.

The previous prime is 61553408399629. The next prime is 61553408399737. The reversal of 61553408399731 is 13799380435516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61553408399731 - 2¹³ = 61553408391539 is a prime.

It is a super-2 number, since 2×61553408399731² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61553408399737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30776704199865 + 30776704199866.

It is an arithmetic number, because the mean of its divisors is an integer number (30776704199866).

Almost surely, 2^{61553408399731} is an apocalyptic number.

61553408399731 is a deficient number, since it is larger than the sum of its proper divisors (1).

61553408399731 is an equidigital number, since it uses as much as digits as its factorization.

61553408399731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73483200, while the sum is 64.

The spelling of 61553408399731 in words is "sixty-one trillion, five hundred fifty-three billion, four hundred eight million, three hundred ninety-nine thousand, seven hundred thirty-one".