81368256294 has 80 divisors (see below), whose sum is σ = 201657134448. Its totient is φ = 24359704128.

The previous prime is 81368256269. The next prime is 81368256397. The reversal of 81368256294 is 49265286318.

81368256294 is a `hidden beast` number, since 8 + 1 + 3 + 6 + 8 + 2 + 5 + 629 + 4 = 666.

It is a super-2 number, since 2×81368256294² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 81368256294.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 444192 + ... + 600035.

Almost surely, 2^81368256294 is an apocalyptic number.

81368256294 is an abundant number, since it is smaller than the sum of its proper divisors (120288878154).

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

81368256294 is a wasteful number, since it uses less digits than its factorization.

81368256294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044291 (or 1044282 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 81368256294 in words is "eighty-one billion, three hundred sixty-eight million, two hundred fifty-six thousand, two hundred ninety-four".