81000373507 has 16 divisors (see below), whose sum is σ = 85590583200. Its totient is φ = 76443402240.

The previous prime is 81000373481. The next prime is 81000373513. The reversal of 81000373507 is 70537300018.

It is not a de Polignac number, because 81000373507 - 2¹⁵ = 81000340739 is a prime.

It is a super-2 number, since 2×81000373507² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81000373567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5906883 + ... + 5920579.

It is an arithmetic number, because the mean of its divisors is an integer number (5349411450).

Almost surely, 2^81000373507 is an apocalyptic number.

81000373507 is a deficient number, since it is larger than the sum of its proper divisors (4590209693).

81000373507 is a wasteful number, since it uses less digits than its factorization.

81000373507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14886.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 81000373507 in words is "eighty-one billion, three hundred seventy-three thousand, five hundred seven".