83991730975 has 12 divisors (see below), whose sum is σ = 105704222344. Its totient is φ = 66190497120.

The previous prime is 83991730937. The next prime is 83991731009. The reversal of 83991730975 is 57903719938.

It is not a de Polignac number, because 83991730975 - 2⁹ = 83991730463 is a prime.

It is a super-2 number, since 2×83991730975² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 25070484 + ... + 25073833.

Almost surely, 2^83991730975 is an apocalyptic number.

83991730975 is a deficient number, since it is larger than the sum of its proper divisors (21712491369).

83991730975 is a wasteful number, since it uses less digits than its factorization.

83991730975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50144394 (or 50144389 counting only the distinct ones).

The product of its (nonzero) digits is 12859560, while the sum is 61.

The spelling of 83991730975 in words is "eighty-three billion, nine hundred ninety-one million, seven hundred thirty thousand, nine hundred seventy-five".