1660656540 has 24 divisors (see below), whose sum is σ = 4649838480. Its totient is φ = 442841728.

The previous prime is 1660656469. The next prime is 1660656553. The reversal of 1660656540 is 456560661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13838745 + ... + 13838864.

It is an arithmetic number, because the mean of its divisors is an integer number (193743270).

Almost surely, 2^1660656540 is an apocalyptic number.

1660656540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1660656540 is an abundant number, since it is smaller than the sum of its proper divisors (2989181940).

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

1660656540 is a wasteful number, since it uses less digits than its factorization.

1660656540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27677621 (or 27677619 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1660656540 is about 40751.1538486949. The cubic root of 1660656540 is about 1184.2042263597.

The spelling of 1660656540 in words is "one billion, six hundred sixty million, six hundred fifty-six thousand, five hundred forty".