81502381023 has 16 divisors (see below), whose sum is σ = 124373857536. Its totient is φ = 46505381760.

The previous prime is 81502381007. The next prime is 81502381031. The reversal of 81502381023 is 32018320518.

It is not a de Polignac number, because 81502381023 - 2⁴ = 81502381007 is a prime.

It is a super-2 number, since 2×81502381023² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81502381003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2793786 + ... + 2822807.

It is an arithmetic number, because the mean of its divisors is an integer number (7773366096).

Almost surely, 2^81502381023 is an apocalyptic number.

81502381023 is a deficient number, since it is larger than the sum of its proper divisors (42871476513).

81502381023 is a wasteful number, since it uses less digits than its factorization.

81502381023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617294.

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 81502381023 in words is "eighty-one billion, five hundred two million, three hundred eighty-one thousand, twenty-three".