61553408399629 has 2 divisors, whose sum is σ = 61553408399630. Its totient is φ = 61553408399628.

The previous prime is 61553408399621. The next prime is 61553408399731. The reversal of 61553408399629 is 92699380435516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54250929063529 + 7302479336100 = 7365523^2 + 2702310^2 .

It is a cyclic number.

It is not a de Polignac number, because 61553408399629 - 2³ = 61553408399621 is a prime.

It is a super-2 number, since 2×61553408399629² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61553408399621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30776704199814 + 30776704199815.

It is an arithmetic number, because the mean of its divisors is an integer number (30776704199815).

Almost surely, 2^{61553408399629} is an apocalyptic number.

It is an amenable number.

61553408399629 is a deficient number, since it is larger than the sum of its proper divisors (1).

61553408399629 is an equidigital number, since it uses as much as digits as its factorization.

61553408399629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 377913600, while the sum is 70.

The spelling of 61553408399629 in words is "sixty-one trillion, five hundred fifty-three billion, four hundred eight million, three hundred ninety-nine thousand, six hundred twenty-nine".