81377123260 has 72 divisors (see below), whose sum is σ = 174467326320. Its totient is φ = 31883524608.

The previous prime is 81377123167. The next prime is 81377123287. The reversal of 81377123260 is 6232177318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63426579 + ... + 63427861.

It is an arithmetic number, because the mean of its divisors is an integer number (2423157310).

Almost surely, 2^81377123260 is an apocalyptic number.

It is an amenable number.

81377123260 is an abundant number, since it is smaller than the sum of its proper divisors (93090203060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81377123260 is a wasteful number, since it uses less digits than its factorization.

81377123260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 40.

The spelling of 81377123260 in words is "eighty-one billion, three hundred seventy-seven million, one hundred twenty-three thousand, two hundred sixty".