1669403974920 has 128 divisors (see below), whose sum is σ = 5596760292480. Its totient is φ = 394833152000.

The previous prime is 1669403974871. The next prime is 1669403974963. The reversal of 1669403974920 is 294793049661.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15369051 + ... + 15477290.

It is an arithmetic number, because the mean of its divisors is an integer number (43724689785).

Almost surely, 2^{1669403974920} is an apocalyptic number.

1669403974920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1669403974920 is an abundant number, since it is smaller than the sum of its proper divisors (3927356317560).

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

1669403974920 is a wasteful number, since it uses less digits than its factorization.

1669403974920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30846407 (or 30846403 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 60.

The spelling of 1669403974920 in words is "one trillion, six hundred sixty-nine billion, four hundred three million, nine hundred seventy-four thousand, nine hundred twenty".