1657021055 has 4 divisors (see below), whose sum is σ = 1988425272. Its totient is φ = 1325616840.

The previous prime is 1657021043. The next prime is 1657021063. The reversal of 1657021055 is 5501207561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1657021055 - 2¹⁶ = 1656955519 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 3 ways as a sum of consecutive naturals, for example, 165702101 + ... + 165702110.

It is an arithmetic number, because the mean of its divisors is an integer number (497106318).

Almost surely, 2^1657021055 is an apocalyptic number.

1657021055 is a deficient number, since it is larger than the sum of its proper divisors (331404217).

1657021055 is an equidigital number, since it uses as much as digits as its factorization.

1657021055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331404216.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 1657021055 is about 40706.5234943983. The cubic root of 1657021055 is about 1183.3394474766.

The spelling of 1657021055 in words is "one billion, six hundred fifty-seven million, twenty-one thousand, fifty-five".