81290372054 has 8 divisors (see below), whose sum is σ = 122045512320. Its totient is φ = 40608534616.

The previous prime is 81290371933. The next prime is 81290372087. The reversal of 81290372054 is 45027309218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18322934 + ... + 18327369.

It is an arithmetic number, because the mean of its divisors is an integer number (15255689040).

Almost surely, 2^81290372054 is an apocalyptic number.

81290372054 is a deficient number, since it is larger than the sum of its proper divisors (40755140266).

81290372054 is a wasteful number, since it uses less digits than its factorization.

81290372054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36651414.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 81290372054 in words is "eighty-one billion, two hundred ninety million, three hundred seventy-two thousand, fifty-four".