61917079123 has 6 divisors (see below), whose sum is σ = 63978835092. Its totient is φ = 59919753060.

The previous prime is 61917079117. The next prime is 61917079157. The reversal of 61917079123 is 32197071916.

It is a de Polignac number, because none of the positive numbers 2^k-61917079123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61917079223) 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 5 ways as a sum of consecutive naturals, for example, 32213961 + ... + 32215882.

It is an arithmetic number, because the mean of its divisors is an integer number (10663139182).

Almost surely, 2^61917079123 is an apocalyptic number.

61917079123 is a deficient number, since it is larger than the sum of its proper divisors (2061755969).

61917079123 is an equidigital number, since it uses as much as digits as its factorization.

61917079123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64429905 (or 64429874 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 46.

The spelling of 61917079123 in words is "sixty-one billion, nine hundred seventeen million, seventy-nine thousand, one hundred twenty-three".