1659721902 has 48 divisors (see below), whose sum is σ = 3447102720. Its totient is φ = 532658880.

The previous prime is 1659721897. The next prime is 1659721907. The reversal of 1659721902 is 2091279561.

It is an interprime number because it is at equal distance from previous prime (1659721897) and next prime (1659721907).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659721907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 795753 + ... + 797835.

It is an arithmetic number, because the mean of its divisors is an integer number (71814640).

Almost surely, 2^1659721902 is an apocalyptic number.

1659721902 is an abundant number, since it is smaller than the sum of its proper divisors (1787380818).

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

1659721902 is a wasteful number, since it uses less digits than its factorization.

1659721902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2249 (or 2208 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 1659721902 is about 40739.6846084994. The cubic root of 1659721902 is about 1183.9820230828.

The spelling of 1659721902 in words is "one billion, six hundred fifty-nine million, seven hundred twenty-one thousand, nine hundred two".