61971658497 has 16 divisors (see below), whose sum is σ = 104925559680. Its totient is φ = 35412376176.

The previous prime is 61971658457. The next prime is 61971658537. The reversal of 61971658497 is 79485617916.

61971658497 is a `hidden beast` number, since 6 + 1 + 97 + 1 + 6 + 58 + 497 = 666.

It is an interprime number because it is at equal distance from previous prime (61971658457) and next prime (61971658537).

It is not a de Polignac number, because 61971658497 - 2¹² = 61971654401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (61971658417) 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 15 ways as a sum of consecutive naturals, for example, 163945998 + ... + 163946375.

It is an arithmetic number, because the mean of its divisors is an integer number (6557847480).

Almost surely, 2^61971658497 is an apocalyptic number.

It is an amenable number.

61971658497 is a deficient number, since it is larger than the sum of its proper divisors (42953901183).

61971658497 is a wasteful number, since it uses less digits than its factorization.

61971658497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327892389 (or 327892383 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 63.

The spelling of 61971658497 in words is "sixty-one billion, nine hundred seventy-one million, six hundred fifty-eight thousand, four hundred ninety-seven".