81615091324 has 24 divisors (see below), whose sum is σ = 153858988640. Its totient is φ = 37657255104.

The previous prime is 81615091309. The next prime is 81615091333. The reversal of 81615091324 is 42319051618.

It is a super-3 number, since 3×81615091324³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57264 + ... + 408055.

Almost surely, 2^81615091324 is an apocalyptic number.

It is an amenable number.

81615091324 is a deficient number, since it is larger than the sum of its proper divisors (72243897316).

81615091324 is a wasteful number, since it uses less digits than its factorization.

81615091324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468709 (or 468707 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 81615091324 in words is "eighty-one billion, six hundred fifteen million, ninety-one thousand, three hundred twenty-four".