61971216487 has 16 divisors (see below), whose sum is σ = 66787315200. Its totient is φ = 57316809600.

The previous prime is 61971216479. The next prime is 61971216499. The reversal of 61971216487 is 78461217916.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 61971216487 - 2³ = 61971216479 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 (61971216187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271564 + ... + 444622.

It is an arithmetic number, because the mean of its divisors is an integer number (4174207200).

Almost surely, 2^61971216487 is an apocalyptic number.

61971216487 is a deficient number, since it is larger than the sum of its proper divisors (4816098713).

61971216487 is a wasteful number, since it uses less digits than its factorization.

61971216487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173526.

The product of its digits is 1016064, while the sum is 52.

The spelling of 61971216487 in words is "sixty-one billion, nine hundred seventy-one million, two hundred sixteen thousand, four hundred eighty-seven".