81615808462 has 8 divisors (see below), whose sum is σ = 122426070336. Its totient is φ = 40807118352.

The previous prime is 81615808381. The next prime is 81615808481. The reversal of 81615808462 is 26480851618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81615808462² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253183 + ... + 476794.

It is an arithmetic number, because the mean of its divisors is an integer number (15303258792).

Almost surely, 2^81615808462 is an apocalyptic number.

81615808462 is a deficient number, since it is larger than the sum of its proper divisors (40810261874).

81615808462 is a wasteful number, since it uses less digits than its factorization.

81615808462 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785882.

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 81615808462 in words is "eighty-one billion, six hundred fifteen million, eight hundred eight thousand, four hundred sixty-two".