81125697606262 has 4 divisors (see below), whose sum is σ = 121688546409396. Its totient is φ = 40562848803130.

The previous prime is 81125697606259. The next prime is 81125697606301. The reversal of 81125697606262 is 26260679652118.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×81125697606262² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81125697606262.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20281424401564 + ... + 20281424401567.

It is an arithmetic number, because the mean of its divisors is an integer number (30422136602349).

Almost surely, 2^{81125697606262} is an apocalyptic number.

81125697606262 is a deficient number, since it is larger than the sum of its proper divisors (40562848803134).

81125697606262 is a wasteful number, since it uses less digits than its factorization.

81125697606262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40562848803133.

The product of its (nonzero) digits is 26127360, while the sum is 61.

The spelling of 81125697606262 in words is "eighty-one trillion, one hundred twenty-five billion, six hundred ninety-seven million, six hundred six thousand, two hundred sixty-two".