81742885692 has 24 divisors (see below), whose sum is σ = 205405200336. Its totient is φ = 25151657088.

The previous prime is 81742885681. The next prime is 81742885703. The reversal of 81742885692 is 29658824718.

It is an interprime number because it is at equal distance from previous prime (81742885681) and next prime (81742885703).

It is a super-2 number, since 2×81742885692² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261996273 + ... + 261996584.

It is an arithmetic number, because the mean of its divisors is an integer number (8558550014).

Almost surely, 2^81742885692 is an apocalyptic number.

It is an amenable number.

81742885692 is an abundant number, since it is smaller than the sum of its proper divisors (123662314644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81742885692 is a wasteful number, since it uses less digits than its factorization.

81742885692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523992877 (or 523992875 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 60.

The spelling of 81742885692 in words is "eighty-one billion, seven hundred forty-two million, eight hundred eighty-five thousand, six hundred ninety-two".