1601655620 has 12 divisors (see below), whose sum is σ = 3363476844. Its totient is φ = 640662240.

The previous prime is 1601655619. The next prime is 1601655631. The reversal of 1601655620 is 265561061.

It can be written as a sum of positive squares in 2 ways, for example, as 594481924 + 1007173696 = 24382^2 + 31736^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40041371 + ... + 40041410.

It is an arithmetic number, because the mean of its divisors is an integer number (280289737).

Almost surely, 2^1601655620 is an apocalyptic number.

1601655620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601655620 is an abundant number, since it is smaller than the sum of its proper divisors (1761821224).

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

1601655620 is a wasteful number, since it uses less digits than its factorization.

1601655620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80082790 (or 80082788 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1601655620 is about 40020.6898991009. The cubic root of 1601655620 is about 1170.0103780705.

The spelling of 1601655620 in words is "one billion, six hundred one million, six hundred fifty-five thousand, six hundred twenty".