61431574163 has 4 divisors (see below), whose sum is σ = 61438726800. Its totient is φ = 61424421528.

The previous prime is 61431574129. The next prime is 61431574181. The reversal of 61431574163 is 36147513416.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61431574163 - 2²² = 61427379859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61431574163.

It is not an unprimeable number, because it can be changed into a prime (61431574063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3563420 + ... + 3580617.

It is an arithmetic number, because the mean of its divisors is an integer number (15359681700).

Almost surely, 2^61431574163 is an apocalyptic number.

61431574163 is a deficient number, since it is larger than the sum of its proper divisors (7152637).

61431574163 is an equidigital number, since it uses as much as digits as its factorization.

61431574163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152636.

The product of its digits is 181440, while the sum is 41.

The spelling of 61431574163 in words is "sixty-one billion, four hundred thirty-one million, five hundred seventy-four thousand, one hundred sixty-three".