61431990863 has 8 divisors (see below), whose sum is σ = 64668616320. Its totient is φ = 58195701720.

The previous prime is 61431990803. The next prime is 61431990883. The reversal of 61431990863 is 36809913416.

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 61431990863 - 2¹² = 61431986767 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 (61431990803) 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 7 ways as a sum of consecutive naturals, for example, 347798 + ... + 493788.

It is an arithmetic number, because the mean of its divisors is an integer number (8083577040).

Almost surely, 2^61431990863 is an apocalyptic number.

61431990863 is a deficient number, since it is larger than the sum of its proper divisors (3236625457).

61431990863 is a wasteful number, since it uses less digits than its factorization.

61431990863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168157.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 61431990863 in words is "sixty-one billion, four hundred thirty-one million, nine hundred ninety thousand, eight hundred sixty-three".