16401660 has 48 divisors (see below), whose sum is σ = 50101632. Its totient is φ = 3976000.

The previous prime is 16401641. The next prime is 16401701. The reversal of 16401660 is 6610461.

It is a self number, because there is not a number n which added to its sum of digits gives 16401660.

It is a congruent number.

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, 11766 + ... + 13085.

It is an arithmetic number, because the mean of its divisors is an integer number (1043784).

Almost surely, 2^16401660 is an apocalyptic number.

16401660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16401660 is an abundant number, since it is smaller than the sum of its proper divisors (33699972).

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

16401660 is a wasteful number, since it uses less digits than its factorization.

16401660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24874 (or 24872 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 16401660 is about 4049.8962949686. The cubic root of 16401660 is about 254.0753904384.

The spelling of 16401660 in words is "sixteen million, four hundred one thousand, six hundred sixty".