1657670453 has 4 divisors (see below), whose sum is σ = 1688947308. Its totient is φ = 1626393600.

The previous prime is 1657670437. The next prime is 1657670461. The reversal of 1657670453 is 3540767561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3540767561 = 36307 ⋅97523.

It can be written as a sum of positive squares in 2 ways, for example, as 739459249 + 918211204 = 27193^2 + 30302^2 .

It is a cyclic number.

It is not a de Polignac number, because 1657670453 - 2⁴ = 1657670437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657670953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15638348 + ... + 15638453.

It is an arithmetic number, because the mean of its divisors is an integer number (422236827).

Almost surely, 2^1657670453 is an apocalyptic number.

It is an amenable number.

1657670453 is a deficient number, since it is larger than the sum of its proper divisors (31276855).

1657670453 is an equidigital number, since it uses as much as digits as its factorization.

1657670453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31276854.

The product of its (nonzero) digits is 529200, while the sum is 44.

The square root of 1657670453 is about 40714.4992969335. The cubic root of 1657670453 is about 1183.4940135883.

The spelling of 1657670453 in words is "one billion, six hundred fifty-seven million, six hundred seventy thousand, four hundred fifty-three".