61712991123 has 32 divisors (see below), whose sum is σ = 97158964224. Its totient is φ = 34105940352.

The previous prime is 61712991107. The next prime is 61712991161. The reversal of 61712991123 is 32119921716.

61712991123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61712991123 - 2⁴ = 61712991107 is a prime.

It is a super-2 number, since 2×61712991123² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61712991323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108040 + ... + 367557.

It is an arithmetic number, because the mean of its divisors is an integer number (3036217632).

Almost surely, 2^61712991123 is an apocalyptic number.

61712991123 is a deficient number, since it is larger than the sum of its proper divisors (35445973101).

61712991123 is a wasteful number, since it uses less digits than its factorization.

61712991123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475811.

The product of its digits is 40824, while the sum is 42.

The spelling of 61712991123 in words is "sixty-one billion, seven hundred twelve million, nine hundred ninety-one thousand, one hundred twenty-three".