71935951861 has 4 divisors (see below), whose sum is σ = 71959455724. Its totient is φ = 71912448000.

The previous prime is 71935951823. The next prime is 71935951931. The reversal of 71935951861 is 16815953917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43017248836 + 28918703025 = 207406^2 + 170055^2 .

It is a 7-Lehmer number, since φ(71935951861) divides (71935951861-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 71935951861 - 2⁹ = 71935951349 is a prime.

It is a pancake number, because a pancake can be divided into 71935951861 parts by 379304 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71935951811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11747340 + ... + 11753461.

It is an arithmetic number, because the mean of its divisors is an integer number (17989863931).

Almost surely, 2^71935951861 is an apocalyptic number.

It is an amenable number.

71935951861 is a deficient number, since it is larger than the sum of its proper divisors (23503863).

71935951861 is a wasteful number, since it uses less digits than its factorization.

71935951861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23503862.

The product of its digits is 2041200, while the sum is 55.

The spelling of 71935951861 in words is "seventy-one billion, nine hundred thirty-five million, nine hundred fifty-one thousand, eight hundred sixty-one".