1660156889 has 8 divisors (see below), whose sum is σ = 1696050048. Its totient is φ = 1624287600.

The previous prime is 1660156831. The next prime is 1660156891. The reversal of 1660156889 is 9886510661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1660156889 is a prime.

It is a super-2 number, since 2×1660156889² = 5512241792188316642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1660156829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271979 + ... + 278015.

It is an arithmetic number, because the mean of its divisors is an integer number (212006256).

Almost surely, 2^1660156889 is an apocalyptic number.

It is an amenable number.

1660156889 is a deficient number, since it is larger than the sum of its proper divisors (35893159).

1660156889 is an equidigital number, since it uses as much as digits as its factorization.

1660156889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11935.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 1660156889 is about 40745.0228739658. The cubic root of 1660156889 is about 1184.0854484019.

The spelling of 1660156889 in words is "one billion, six hundred sixty million, one hundred fifty-six thousand, eight hundred eighty-nine".