1660696656 has 20 divisors (see below), whose sum is σ = 4290133152. Its totient is φ = 553565536.

The previous prime is 1660696651. The next prime is 1660696699. The reversal of 1660696656 is 6566960661.

It is a junction number, because it is equal to n+sod(n) for n = 1660696599 and 1660696608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660696651) 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, 17298876 + ... + 17298971.

Almost surely, 2^1660696656 is an apocalyptic number.

1660696656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1660696656 is an abundant number, since it is smaller than the sum of its proper divisors (2629436496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660696656 is a wasteful number, since it uses less digits than its factorization.

1660696656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34597858 (or 34597852 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 51.

The square root of 1660696656 is about 40751.6460526443. The cubic root of 1660696656 is about 1184.2137617760.

The spelling of 1660696656 in words is "one billion, six hundred sixty million, six hundred ninety-six thousand, six hundred fifty-six".