81600654237 has 4 divisors (see below), whose sum is σ = 108800872320. Its totient is φ = 54400436156.

The previous prime is 81600654229. The next prime is 81600654253. The reversal of 81600654237 is 73245600618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81600654237 - 2³ = 81600654229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81600654257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13600109037 + ... + 13600109042.

It is an arithmetic number, because the mean of its divisors is an integer number (27200218080).

Almost surely, 2^81600654237 is an apocalyptic number.

It is an amenable number.

81600654237 is a deficient number, since it is larger than the sum of its proper divisors (27200218083).

81600654237 is a wasteful number, since it uses less digits than its factorization.

81600654237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27200218082.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 81600654237 in words is "eighty-one billion, six hundred million, six hundred fifty-four thousand, two hundred thirty-seven".