1601555880 has 32 divisors (see below), whose sum is σ = 4804668000. Its totient is φ = 427081536.

The previous prime is 1601555867. The next prime is 1601555887. The reversal of 1601555880 is 885551061.

It is not an unprimeable number, because it can be changed into a prime (1601555887) 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 7 ways as a sum of consecutive naturals, for example, 6673030 + ... + 6673269.

It is an arithmetic number, because the mean of its divisors is an integer number (150145875).

Almost surely, 2^1601555880 is an apocalyptic number.

1601555880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601555880 is an abundant number, since it is smaller than the sum of its proper divisors (3203112120).

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

1601555880 is a wasteful number, since it uses less digits than its factorization.

1601555880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13346313 (or 13346309 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 39.

The square root of 1601555880 is about 40019.4437742455. The cubic root of 1601555880 is about 1169.9860908566.

The spelling of 1601555880 in words is "one billion, six hundred one million, five hundred fifty-five thousand, eight hundred eighty".