81214037494 has 32 divisors (see below), whose sum is σ = 128780870400. Its totient is φ = 38305703520.

The previous prime is 81214037483. The next prime is 81214037501. The reversal of 81214037494 is 49473041218.

It is a self number, because there is not a number n which added to its sum of digits gives 81214037494.

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, 9323089 + ... + 9331795.

It is an arithmetic number, because the mean of its divisors is an integer number (4024402200).

Almost surely, 2^81214037494 is an apocalyptic number.

81214037494 is a deficient number, since it is larger than the sum of its proper divisors (47566832906).

81214037494 is a wasteful number, since it uses less digits than its factorization.

81214037494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 81214037494 in words is "eighty-one billion, two hundred fourteen million, thirty-seven thousand, four hundred ninety-four".