81926650927 has 4 divisors (see below), whose sum is σ = 89374528296. Its totient is φ = 74478773560.

The previous prime is 81926650843. The next prime is 81926650957. The reversal of 81926650927 is 72905662918.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81926650927 is a prime.

It is a super-2 number, since 2×81926650927² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81926650957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3723938668 + ... + 3723938689.

It is an arithmetic number, because the mean of its divisors is an integer number (22343632074).

Almost surely, 2^81926650927 is an apocalyptic number.

81926650927 is a deficient number, since it is larger than the sum of its proper divisors (7447877369).

81926650927 is a wasteful number, since it uses less digits than its factorization.

81926650927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7447877368.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 81926650927 in words is "eighty-one billion, nine hundred twenty-six million, six hundred fifty thousand, nine hundred twenty-seven".