1664988015 has 16 divisors (see below), whose sum is σ = 2700475488. Its totient is φ = 875828736.

The previous prime is 1664987981. The next prime is 1664988047. The reversal of 1664988015 is 5108894661.

It is not a de Polignac number, because 1664988015 - 2¹² = 1664983919 is a prime.

It is a congruent 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, 759174 + ... + 761363.

It is an arithmetic number, because the mean of its divisors is an integer number (168779718).

Almost surely, 2^1664988015 is an apocalyptic number.

1664988015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664988015 is a deficient number, since it is larger than the sum of its proper divisors (1035487473).

1664988015 is a wasteful number, since it uses less digits than its factorization.

1664988015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520618.

The product of its (nonzero) digits is 414720, while the sum is 48.

The square root of 1664988015 is about 40804.2646668213. The cubic root of 1664988015 is about 1185.2329154587.

The spelling of 1664988015 in words is "one billion, six hundred sixty-four million, nine hundred eighty-eight thousand, fifteen".