1657145090 has 16 divisors (see below), whose sum is σ = 3013614072. Its totient is φ = 656024064.

The previous prime is 1657145089. The next prime is 1657145099. The reversal of 1657145090 is 905417561.

It can be written as a sum of positive squares in 4 ways, for example, as 770118001 + 887027089 = 27751^2 + 29783^2 .

It is a super-2 number, since 2×1657145090² = 5492259698622216200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1657145099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 853229 + ... + 855168.

Almost surely, 2^1657145090 is an apocalyptic number.

1657145090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1657145090 is a deficient number, since it is larger than the sum of its proper divisors (1356468982).

1657145090 is a wasteful number, since it uses less digits than its factorization.

1657145090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1708501.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 1657145090 is about 40708.0469931929. The cubic root of 1657145090 is about 1183.3689727193.

The spelling of 1657145090 in words is "one billion, six hundred fifty-seven million, one hundred forty-five thousand, ninety".