61971216488 has 16 divisors (see below), whose sum is σ = 117324149280. Its totient is φ = 30684776688.

The previous prime is 61971216479. The next prime is 61971216499. The reversal of 61971216488 is 88461217916.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 37603070 + ... + 37604717.

It is an arithmetic number, because the mean of its divisors is an integer number (7332759330).

Almost surely, 2^61971216488 is an apocalyptic number.

It is an amenable number.

61971216488 is a deficient number, since it is larger than the sum of its proper divisors (55352932792).

61971216488 is a wasteful number, since it uses less digits than its factorization.

61971216488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75207896 (or 75207892 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The spelling of 61971216488 in words is "sixty-one billion, nine hundred seventy-one million, two hundred sixteen thousand, four hundred eighty-eight".