81177678674 has 16 divisors (see below), whose sum is σ = 122108633088. Its totient is φ = 40474912032.

The previous prime is 81177678667. The next prime is 81177678683. The reversal of 81177678674 is 47687677118.

It is a Curzon 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, 1493279 + ... + 1546685.

It is an arithmetic number, because the mean of its divisors is an integer number (7631789568).

Almost surely, 2^81177678674 is an apocalyptic number.

81177678674 is a deficient number, since it is larger than the sum of its proper divisors (40930954414).

81177678674 is a wasteful number, since it uses less digits than its factorization.

81177678674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55529.

The product of its digits is 22127616, while the sum is 62.

The spelling of 81177678674 in words is "eighty-one billion, one hundred seventy-seven million, six hundred seventy-eight thousand, six hundred seventy-four".