81626971190 has 16 divisors (see below), whose sum is σ = 146958182928. Its totient is φ = 32644202976.

The previous prime is 81626971189. The next prime is 81626971219. The reversal of 81626971190 is 9117962618.

It is a super-2 number, since 2×81626971190² (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 7 ways as a sum of consecutive naturals, for example, 770972 + ... + 870431.

It is an arithmetic number, because the mean of its divisors is an integer number (9184886433).

Almost surely, 2^81626971190 is an apocalyptic number.

81626971190 is a deficient number, since it is larger than the sum of its proper divisors (65331211738).

81626971190 is a wasteful number, since it uses less digits than its factorization.

81626971190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646383.

The product of its (nonzero) digits is 326592, while the sum is 50.

The spelling of 81626971190 in words is "eighty-one billion, six hundred twenty-six million, nine hundred seventy-one thousand, one hundred ninety".