1664055993615 has 32 divisors (see below), whose sum is σ = 2665329062400. Its totient is φ = 886550372736.

The previous prime is 1664055993539. The next prime is 1664055993623. The reversal of 1664055993615 is 5163995504661.

It is not a de Polignac number, because 1664055993615 - 2⁷ = 1664055993487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150004009 + ... + 150015101.

It is an arithmetic number, because the mean of its divisors is an integer number (83291533200).

Almost surely, 2^{1664055993615} is an apocalyptic number.

1664055993615 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1664055993615 is a deficient number, since it is larger than the sum of its proper divisors (1001273068785).

1664055993615 is a wasteful number, since it uses less digits than its factorization.

1664055993615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863.

The product of its (nonzero) digits is 26244000, while the sum is 60.

The spelling of 1664055993615 in words is "one trillion, six hundred sixty-four billion, fifty-five million, nine hundred ninety-three thousand, six hundred fifteen".