61971216479 has 2 divisors, whose sum is σ = 61971216480. Its totient is φ = 61971216478.

The previous prime is 61971216421. The next prime is 61971216499. The reversal of 61971216479 is 97461217916.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61971216479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61971216479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61971216499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30985608239 + 30985608240.

It is an arithmetic number, because the mean of its divisors is an integer number (30985608240).

Almost surely, 2^61971216479 is an apocalyptic number.

61971216479 is a deficient number, since it is larger than the sum of its proper divisors (1).

61971216479 is an equidigital number, since it uses as much as digits as its factorization.

61971216479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The spelling of 61971216479 in words is "sixty-one billion, nine hundred seventy-one million, two hundred sixteen thousand, four hundred seventy-nine".