81745429876 has 12 divisors (see below), whose sum is σ = 156059457120. Its totient is φ = 37157013560.

The previous prime is 81745429861. The next prime is 81745429877. The reversal of 81745429876 is 67892454718.

It is a super-2 number, since 2×81745429876² (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 (81745429877) 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, 928925296 + ... + 928925383.

It is an arithmetic number, because the mean of its divisors is an integer number (13004954760).

Almost surely, 2^81745429876 is an apocalyptic number.

It is an amenable number.

81745429876 is a deficient number, since it is larger than the sum of its proper divisors (74314027244).

81745429876 is a wasteful number, since it uses less digits than its factorization.

81745429876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857850694 (or 1857850692 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 81745429876 in words is "eighty-one billion, seven hundred forty-five million, four hundred twenty-nine thousand, eight hundred seventy-six".