81901840233532 has 12 divisors (see below), whose sum is σ = 156358058627736. Its totient is φ = 37228109197040.

The previous prime is 81901840233503. The next prime is 81901840233541. The reversal of 81901840233532 is 23533204810918.

It is a super-2 number, since 2×81901840233532² (a number of 29 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 3 ways as a sum of consecutive naturals, for example, 930702729883 + ... + 930702729970.

It is an arithmetic number, because the mean of its divisors is an integer number (13029838218978).

Almost surely, 2^{81901840233532} is an apocalyptic number.

It is an amenable number.

81901840233532 is a deficient number, since it is larger than the sum of its proper divisors (74456218394204).

81901840233532 is a wasteful number, since it uses less digits than its factorization.

81901840233532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861405459868 (or 1861405459866 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 81901840233532 in words is "eighty-one trillion, nine hundred one billion, eight hundred forty million, two hundred thirty-three thousand, five hundred thirty-two".