61630534872431 has 4 divisors (see below), whose sum is σ = 70434896997072. Its totient is φ = 52826172747792.

The previous prime is 61630534872409. The next prime is 61630534872497. The reversal of 61630534872431 is 13427843503616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61630534872431 is a prime.

It is a super-2 number, since 2×61630534872431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61630534872331) 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, 4402181062310 + ... + 4402181062323.

It is an arithmetic number, because the mean of its divisors is an integer number (17608724249268).

Almost surely, 2^{61630534872431} is an apocalyptic number.

61630534872431 is a deficient number, since it is larger than the sum of its proper divisors (8804362124641).

61630534872431 is an equidigital number, since it uses as much as digits as its factorization.

61630534872431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8804362124640.

The product of its (nonzero) digits is 8709120, while the sum is 53.

The spelling of 61630534872431 in words is "sixty-one trillion, six hundred thirty billion, five hundred thirty-four million, eight hundred seventy-two thousand, four hundred thirty-one".