16664379515 has 16 divisors (see below), whose sum is σ = 23285216448. Its totient is φ = 11211398016.

The previous prime is 16664379509. The next prime is 16664379539. The reversal of 16664379515 is 51597346661.

It is not a de Polignac number, because 16664379515 - 2¹⁶ = 16664313979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489892 + ... + 4493601.

It is an arithmetic number, because the mean of its divisors is an integer number (1455326028).

Almost surely, 2^16664379515 is an apocalyptic number.

16664379515 is a deficient number, since it is larger than the sum of its proper divisors (6620836933).

16664379515 is an equidigital number, since it uses as much as digits as its factorization.

16664379515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983558.

The product of its digits is 4082400, while the sum is 53.

The spelling of 16664379515 in words is "sixteen billion, six hundred sixty-four million, three hundred seventy-nine thousand, five hundred fifteen".