81542913976 has 32 divisors (see below), whose sum is σ = 153314441280. Its totient is φ = 40659148800.

The previous prime is 81542913973. The next prime is 81542914039. The reversal of 81542913976 is 67931924518.

It is a happy number.

It is a super-2 number, since 2×81542913976² (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 (81542913973) 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, 11916316 + ... + 11923156.

It is an arithmetic number, because the mean of its divisors is an integer number (4791076290).

Almost surely, 2^81542913976 is an apocalyptic number.

It is an amenable number.

81542913976 is a deficient number, since it is larger than the sum of its proper divisors (71771527304).

81542913976 is a wasteful number, since it uses less digits than its factorization.

81542913976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10735 (or 10731 counting only the distinct ones).

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

The spelling of 81542913976 in words is "eighty-one billion, five hundred forty-two million, nine hundred thirteen thousand, nine hundred seventy-six".