42170812515 has 120 divisors (see below), whose sum is σ = 82074358080. Its totient is φ = 20706057216.

The previous prime is 42170812477. The next prime is 42170812517. The reversal of 42170812515 is 51521807124.

It is a happy number.

It is not a de Polignac number, because 42170812515 - 2⁹ = 42170812003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42170812515.

It is not an unprimeable number, because it can be changed into a prime (42170812517) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 40587366 + ... + 40588404.

It is an arithmetic number, because the mean of its divisors is an integer number (683952984).

Almost surely, 2^42170812515 is an apocalyptic number.

42170812515 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

42170812515 is a deficient number, since it is larger than the sum of its proper divisors (39903545565).

42170812515 is a wasteful number, since it uses less digits than its factorization.

42170812515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 42170812515 in words is "forty-two billion, one hundred seventy million, eight hundred twelve thousand, five hundred fifteen".