402180189815 has 4 divisors (see below), whose sum is σ = 482616227784. Its totient is φ = 321744151848.

The previous prime is 402180189799. The next prime is 402180189863. The reversal of 402180189815 is 518981081204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402180189815 - 2⁴ = 402180189799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402180189815.

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, 40218018977 + ... + 40218018986.

It is an arithmetic number, because the mean of its divisors is an integer number (120654056946).

Almost surely, 2^402180189815 is an apocalyptic number.

402180189815 is a deficient number, since it is larger than the sum of its proper divisors (80436037969).

402180189815 is an equidigital number, since it uses as much as digits as its factorization.

402180189815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80436037968.

The product of its (nonzero) digits is 184320, while the sum is 47.

The spelling of 402180189815 in words is "four hundred two billion, one hundred eighty million, one hundred eighty-nine thousand, eight hundred fifteen".