61975690931 has 18 divisors (see below), whose sum is σ = 78655521852. Its totient is φ = 48288242520.

The previous prime is 61975690877. The next prime is 61975690961. The reversal of 61975690931 is 13909657916.

It is not a de Polignac number, because 61975690931 - 2⁶ = 61975690867 is a prime.

It is a super-3 number, since 3×61975690931³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61975690961) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5774336 + ... + 5785058.

It is an arithmetic number, because the mean of its divisors is an integer number (4369751214).

Almost surely, 2^61975690931 is an apocalyptic number.

61975690931 is a deficient number, since it is larger than the sum of its proper divisors (16679830921).

61975690931 is an frugal number, since it uses more digits than its factorization.

61975690931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21471 (or 10741 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 56.

The spelling of 61975690931 in words is "sixty-one billion, nine hundred seventy-five million, six hundred ninety thousand, nine hundred thirty-one".