1660900879 has 4 divisors (see below), whose sum is σ = 1811891880. Its totient is φ = 1509909880.

The previous prime is 1660900877. The next prime is 1660900883. The reversal of 1660900879 is 9780090661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9780090661 = 11 ⋅889099151.

It is a cyclic number.

It is not a de Polignac number, because 1660900879 - 2¹ = 1660900877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660900873) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 75495484 + ... + 75495505.

It is an arithmetic number, because the mean of its divisors is an integer number (452972970).

Almost surely, 2^1660900879 is an apocalyptic number.

1660900879 is a deficient number, since it is larger than the sum of its proper divisors (150991001).

1660900879 is a wasteful number, since it uses less digits than its factorization.

1660900879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150991000.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1660900879 is about 40754.1516780806. The cubic root of 1660900879 is about 1184.2623024037.

The spelling of 1660900879 in words is "one billion, six hundred sixty million, nine hundred thousand, eight hundred seventy-nine".