81764713912 has 32 divisors (see below), whose sum is σ = 175687557120. Its totient is φ = 34946529120.

The previous prime is 81764713889. The next prime is 81764713913. The reversal of 81764713912 is 21931746718.

It is a super-2 number, since 2×81764713912² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81764713913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1968664 + ... + 2009767.

It is an arithmetic number, because the mean of its divisors is an integer number (5490236160).

Almost surely, 2^81764713912 is an apocalyptic number.

It is an amenable number.

81764713912 is an abundant number, since it is smaller than the sum of its proper divisors (93922843208).

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

81764713912 is a wasteful number, since it uses less digits than its factorization.

81764713912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3978811 (or 3978807 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The spelling of 81764713912 in words is "eighty-one billion, seven hundred sixty-four million, seven hundred thirteen thousand, nine hundred twelve".