1401666656 has 24 divisors (see below), whose sum is σ = 2971803744. Its totient is φ = 646922880.

The previous prime is 1401666647. The next prime is 1401666719. The reversal of 1401666656 is 6566661041.

It is a congruent number.

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, 1684280 + ... + 1685111.

It is an arithmetic number, because the mean of its divisors is an integer number (123825156).

Almost surely, 2^1401666656 is an apocalyptic number.

1401666656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1401666656 is an abundant number, since it is smaller than the sum of its proper divisors (1570137088).

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

1401666656 is a wasteful number, since it uses less digits than its factorization.

1401666656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369414 (or 3369406 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 1401666656 is about 37438.8388708838. The cubic root of 1401666656 is about 1119.1326873819.

The spelling of 1401666656 in words is "one billion, four hundred one million, six hundred sixty-six thousand, six hundred fifty-six".