1657144453 has 4 divisors (see below), whose sum is σ = 1659543328. Its totient is φ = 1654745580.

The previous prime is 1657144429. The next prime is 1657144469. The reversal of 1657144453 is 3544417561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3544417561 = 239 ⋅14830199.

It is a cyclic number.

It is not a de Polignac number, because 1657144453 - 2²⁹ = 1120273541 is a prime.

It is a super-2 number, since 2×1657144453² = 5492255476217338418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657142453) 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 3 ways as a sum of consecutive naturals, for example, 1198401 + ... + 1199782.

It is an arithmetic number, because the mean of its divisors is an integer number (414885832).

Almost surely, 2^1657144453 is an apocalyptic number.

It is an amenable number.

1657144453 is a deficient number, since it is larger than the sum of its proper divisors (2398875).

1657144453 is an equidigital number, since it uses as much as digits as its factorization.

1657144453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398874.

The product of its digits is 201600, while the sum is 40.

The square root of 1657144453 is about 40708.0391691862. The cubic root of 1657144453 is about 1183.3688210918.

The spelling of 1657144453 in words is "one billion, six hundred fifty-seven million, one hundred forty-four thousand, four hundred fifty-three".