1901665856 has 14 divisors (see below), whose sum is σ = 3773618310. Its totient is φ = 950832896.

The previous prime is 1901665847. The next prime is 1901665861. The reversal of 1901665856 is 6585661091.

It can be written as a sum of positive squares in only one way, i.e., 1852441600 + 49224256 = 43040^2 + 7016^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1901665856.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14856701 + ... + 14856828.

It is an arithmetic number, because the mean of its divisors is an integer number (269544165).

Almost surely, 2^1901665856 is an apocalyptic number.

1901665856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1901665856 is a deficient number, since it is larger than the sum of its proper divisors (1871952454).

1901665856 is an equidigital number, since it uses as much as digits as its factorization.

1901665856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29713541 (or 29713531 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The square root of 1901665856 is about 43608.0939276185. The cubic root of 1901665856 is about 1238.9242004689.

The spelling of 1901665856 in words is "one billion, nine hundred one million, six hundred sixty-five thousand, eight hundred fifty-six".