1655415905920 has 256 divisors, whose sum is σ = 4662774144000. Its totient is φ = 561712693248.

The previous prime is 1655415905881. The next prime is 1655415905953. The reversal of 1655415905920 is 295095145561.

It is a happy number.

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, 21254569 + ... + 21332311.

It is an arithmetic number, because the mean of its divisors is an integer number (18213961500).

Almost surely, 2^{1655415905920} is an apocalyptic number.

1655415905920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1655415905920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331387072000).

1655415905920 is an abundant number, since it is smaller than the sum of its proper divisors (3007358238080).

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

1655415905920 is an frugal number, since it uses more digits than its factorization.

1655415905920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77880 (or 77854 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 52.

The spelling of 1655415905920 in words is "one trillion, six hundred fifty-five billion, four hundred fifteen million, nine hundred five thousand, nine hundred twenty".