1665920017420 has 48 divisors (see below), whose sum is σ = 3556133392896. Its totient is φ = 655379424000.

The previous prime is 1665920017409. The next prime is 1665920017439. The reversal of 1665920017420 is 247100295661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13444950 + ... + 13568290.

It is an arithmetic number, because the mean of its divisors is an integer number (74086112352).

Almost surely, 2^{1665920017420} is an apocalyptic number.

1665920017420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665920017420 is an abundant number, since it is smaller than the sum of its proper divisors (1890213375476).

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

1665920017420 is a wasteful number, since it uses less digits than its factorization.

1665920017420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134482 (or 134480 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 1665920017420 in words is "one trillion, six hundred sixty-five billion, nine hundred twenty million, seventeen thousand, four hundred twenty".