81574254737683 has 4 divisors (see below), whose sum is σ = 81574360862488. Its totient is φ = 81574148612880.

The previous prime is 81574254737663. The next prime is 81574254737693. The reversal of 81574254737683 is 38673745247518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81574254737683 is a prime.

It is a super-2 number, since 2×81574254737683² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81574254737663) 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, 51900933 + ... + 53449558.

It is an arithmetic number, because the mean of its divisors is an integer number (20393590215622).

Almost surely, 2^{81574254737683} is an apocalyptic number.

81574254737683 is a deficient number, since it is larger than the sum of its proper divisors (106124805).

81574254737683 is a wasteful number, since it uses less digits than its factorization.

81574254737683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106124804.

The product of its digits is 948326400, while the sum is 70.

The spelling of 81574254737683 in words is "eighty-one trillion, five hundred seventy-four billion, two hundred fifty-four million, seven hundred thirty-seven thousand, six hundred eighty-three".