865331197542 has 36 divisors (see below), whose sum is σ = 2180987816436. Its totient is φ = 247237484760.

The previous prime is 865331197529. The next prime is 865331197571. The reversal of 865331197542 is 245791133568.

It is a happy number.

865331197542 is a `hidden beast` number, since 8 + 6 + 5 + 3 + 3 + 1 + 1 + 97 + 542 = 666.

865331197542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 490549684 + ... + 490551447.

It is an arithmetic number, because the mean of its divisors is an integer number (60582994901).

Almost surely, 2^865331197542 is an apocalyptic number.

865331197542 is an abundant number, since it is smaller than the sum of its proper divisors (1315656618894).

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

865331197542 is a wasteful number, since it uses less digits than its factorization.

865331197542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981101153 (or 981101143 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 865331197542 in words is "eight hundred sixty-five billion, three hundred thirty-one million, one hundred ninety-seven thousand, five hundred forty-two".