1915218816 has 64 divisors (see below), whose sum is σ = 5814065280. Its totient is φ = 547204608.

The previous prime is 1915218779. The next prime is 1915218847. The reversal of 1915218816 is 6188125191.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1915218816² = 7336126226320883712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353566 + ... + 358941.

It is an arithmetic number, because the mean of its divisors is an integer number (90844770).

Almost surely, 2^1915218816 is an apocalyptic number.

1915218816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1915218816 is an abundant number, since it is smaller than the sum of its proper divisors (3898846464).

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

1915218816 is an equidigital number, since it uses as much as digits as its factorization.

1915218816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712531 (or 712519 counting only the distinct ones).

The product of its digits is 34560, while the sum is 42.

The square root of 1915218816 is about 43763.2130447480. The cubic root of 1915218816 is about 1241.8604607768.

The spelling of 1915218816 in words is "one billion, nine hundred fifteen million, two hundred eighteen thousand, eight hundred sixteen".