81673014425631 has 8 divisors (see below), whose sum is σ = 108908071906560. Its totient is φ = 54443316614232.

The previous prime is 81673014425617. The next prime is 81673014425633. The reversal of 81673014425631 is 13652441037618.

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

It is not a de Polignac number, because 81673014425631 - 2⁷ = 81673014425503 is a prime.

It is a super-2 number, since 2×81673014425631² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81673014425633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339881825 + ... + 1339942778.

It is an arithmetic number, because the mean of its divisors is an integer number (13613508988320).

Almost surely, 2^{81673014425631} is an apocalyptic number.

81673014425631 is a deficient number, since it is larger than the sum of its proper divisors (27235057480929).

81673014425631 is a wasteful number, since it uses less digits than its factorization.

81673014425631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679834765.

The product of its (nonzero) digits is 2903040, while the sum is 51.

The spelling of 81673014425631 in words is "eighty-one trillion, six hundred seventy-three billion, fourteen million, four hundred twenty-five thousand, six hundred thirty-one".