3815219661 has 16 divisors (see below), whose sum is σ = 5595279168. Its totient is φ = 2312251920.

The previous prime is 3815219657. The next prime is 3815219687. The reversal of 3815219661 is 1669125183.

It is not a de Polignac number, because 3815219661 - 2² = 3815219657 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3815219651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 473746 + ... + 481731.

It is an arithmetic number, because the mean of its divisors is an integer number (349704948).

Almost surely, 2^3815219661 is an apocalyptic number.

It is an amenable number.

3815219661 is a deficient number, since it is larger than the sum of its proper divisors (1780059507).

3815219661 is an equidigital number, since it uses as much as digits as its factorization.

3815219661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955513 (or 955491 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 3815219661 is about 61767.4644210040. The cubic root of 3815219661 is about 1562.5713211263.

The spelling of 3815219661 in words is "three billion, eight hundred fifteen million, two hundred nineteen thousand, six hundred sixty-one".