61631413617 has 32 divisors (see below), whose sum is σ = 87375974400. Its totient is φ = 38562080832.

The previous prime is 61631413601. The next prime is 61631413637. The reversal of 61631413617 is 71631413616.

It is not a de Polignac number, because 61631413617 - 2⁴ = 61631413601 is a prime.

It is a super-2 number, since 2×61631413617² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61631413637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 734884 + ... + 814442.

It is an arithmetic number, because the mean of its divisors is an integer number (2730499200).

Almost surely, 2^61631413617 is an apocalyptic number.

It is an amenable number.

61631413617 is a deficient number, since it is larger than the sum of its proper divisors (25744560783).

61631413617 is a wasteful number, since it uses less digits than its factorization.

61631413617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79797.

The product of its digits is 54432, while the sum is 39.

Subtracting 61631413617 from its reverse (71631413616), we obtain a palindrome (9999999999).

The spelling of 61631413617 in words is "sixty-one billion, six hundred thirty-one million, four hundred thirteen thousand, six hundred seventeen".