1660695687 has 12 divisors (see below), whose sum is σ = 2741466000. Its totient is φ = 948968928.

The previous prime is 1660695667. The next prime is 1660695691. The reversal of 1660695687 is 7865960661.

1660695687 is a `hidden beast` number, since 16 + 6 + 0 + 69 + 568 + 7 = 666.

It is not a de Polignac number, because 1660695687 - 2⁷ = 1660695559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660695667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13180062 + ... + 13180187.

It is an arithmetic number, because the mean of its divisors is an integer number (228455500).

Almost surely, 2^1660695687 is an apocalyptic number.

1660695687 is a deficient number, since it is larger than the sum of its proper divisors (1080770313).

1660695687 is a wasteful number, since it uses less digits than its factorization.

1660695687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26360262 (or 26360259 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 1660695687 is about 40751.6341635523. The cubic root of 1660695687 is about 1184.2135314503.

The spelling of 1660695687 in words is "one billion, six hundred sixty million, six hundred ninety-five thousand, six hundred eighty-seven".