61971658506 has 48 divisors (see below), whose sum is σ = 138082476168. Its totient is φ = 20074905600.

The previous prime is 61971658457. The next prime is 61971658537. The reversal of 61971658506 is 60585617916.

61971658506 is a `hidden beast` number, since 6 + 1 + 9 + 71 + 65 + 8 + 506 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 42103346481 + 19868312025 = 205191^2 + 140955^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26296 + ... + 353036.

Almost surely, 2^61971658506 is an apocalyptic number.

61971658506 is an abundant number, since it is smaller than the sum of its proper divisors (76110817662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61971658506 is a wasteful number, since it uses less digits than its factorization.

61971658506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327047 (or 327044 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 61971658506 in words is "sixty-one billion, nine hundred seventy-one million, six hundred fifty-eight thousand, five hundred six".