1660993331 has 4 divisors (see below), whose sum is σ = 1661588712. Its totient is φ = 1660397952.

The previous prime is 1660993291. The next prime is 1660993337. The reversal of 1660993331 is 1333990661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1660993331 - 2¹⁸ = 1660731187 is a prime.

It is a super-2 number, since 2×1660993331² = 5517797691252951122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660993337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293486 + ... + 299091.

It is an arithmetic number, because the mean of its divisors is an integer number (415397178).

Almost surely, 2^1660993331 is an apocalyptic number.

1660993331 is a deficient number, since it is larger than the sum of its proper divisors (595381).

1660993331 is an equidigital number, since it uses as much as digits as its factorization.

1660993331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595380.

The product of its (nonzero) digits is 78732, while the sum is 41.

The square root of 1660993331 is about 40755.2859271040. The cubic root of 1660993331 is about 1184.2842754964.

The spelling of 1660993331 in words is "one billion, six hundred sixty million, nine hundred ninety-three thousand, three hundred thirty-one".