81133373678 has 32 divisors (see below), whose sum is σ = 152771581440. Its totient is φ = 31509133920.

The previous prime is 81133373653. The next prime is 81133373687. The reversal of 81133373678 is 87637333118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6624593 + ... + 6636828.

It is an arithmetic number, because the mean of its divisors is an integer number (4774111920).

Almost surely, 2^81133373678 is an apocalyptic number.

81133373678 is a deficient number, since it is larger than the sum of its proper divisors (71638207762).

81133373678 is a wasteful number, since it uses less digits than its factorization.

81133373678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13261472.

The product of its digits is 1524096, while the sum is 50.

The spelling of 81133373678 in words is "eighty-one billion, one hundred thirty-three million, three hundred seventy-three thousand, six hundred seventy-eight".