81877013984 has 48 divisors (see below), whose sum is σ = 163452183552. Its totient is φ = 40367253888.

The previous prime is 81877013983. The next prime is 81877013987. The reversal of 81877013984 is 48931077818.

It is a super-2 number, since 2×81877013984² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81877013983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1359617 + ... + 1418559.

It is an arithmetic number, because the mean of its divisors is an integer number (3405253824).

Almost surely, 2^81877013984 is an apocalyptic number.

It is an amenable number.

81877013984 is a deficient number, since it is larger than the sum of its proper divisors (81575169568).

81877013984 is a wasteful number, since it uses less digits than its factorization.

81877013984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59559 (or 59551 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 81877013984 in words is "eighty-one billion, eight hundred seventy-seven million, thirteen thousand, nine hundred eighty-four".