1657993285 has 16 divisors (see below), whose sum is σ = 2143525104. Its totient is φ = 1223857152.

The previous prime is 1657993261. The next prime is 1657993297. The reversal of 1657993285 is 5823997561.

It can be written as a sum of positive squares in 8 ways, for example, as 318872449 + 1339120836 = 17857^2 + 36594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657993285 - 2²¹ = 1655896133 is a prime.

It is a Duffinian number.

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, 239229 + ... + 246061.

It is an arithmetic number, because the mean of its divisors is an integer number (133970319).

Almost surely, 2^1657993285 is an apocalyptic number.

It is an amenable number.

1657993285 is a deficient number, since it is larger than the sum of its proper divisors (485531819).

1657993285 is a wasteful number, since it uses less digits than its factorization.

1657993285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10584.

The product of its digits is 4082400, while the sum is 55.

The square root of 1657993285 is about 40718.4636866373. The cubic root of 1657993285 is about 1183.5708372494.

The spelling of 1657993285 in words is "one billion, six hundred fifty-seven million, nine hundred ninety-three thousand, two hundred eighty-five".