1661713688 has 64 divisors (see below), whose sum is σ = 3469197600. Its totient is φ = 742533120.

The previous prime is 1661713681. The next prime is 1661713727. The reversal of 1661713688 is 8863171661.

It is a super-2 number, since 2×1661713688² = 5522584761773122688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661713681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237131 + ... + 244037.

Almost surely, 2^1661713688 is an apocalyptic number.

It is an amenable number.

1661713688 is an abundant number, since it is smaller than the sum of its proper divisors (1807483912).

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

1661713688 is a wasteful number, since it uses less digits than its factorization.

1661713688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7020 (or 7016 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 1661713688 is about 40764.1225589366. The cubic root of 1661713688 is about 1184.4554550256.

The spelling of 1661713688 in words is "one billion, six hundred sixty-one million, seven hundred thirteen thousand, six hundred eighty-eight".