61631044279 has 8 divisors (see below), whose sum is σ = 71327068160. Its totient is φ = 52157917656.

The previous prime is 61631044247. The next prime is 61631044291. The reversal of 61631044279 is 97244013616.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61631044279 - 2⁵ = 61631044247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61631044219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55723719 + ... + 55724824.

It is an arithmetic number, because the mean of its divisors is an integer number (8915883520).

Almost surely, 2^61631044279 is an apocalyptic number.

61631044279 is a deficient number, since it is larger than the sum of its proper divisors (9696023881).

61631044279 is a wasteful number, since it uses less digits than its factorization.

61631044279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111448629.

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 61631044279 in words is "sixty-one billion, six hundred thirty-one million, forty-four thousand, two hundred seventy-nine".