1657142543 has 8 divisors (see below), whose sum is σ = 1899854112. Its totient is φ = 1415925216.

The previous prime is 1657142537. The next prime is 1657142567. The reversal of 1657142543 is 3452417561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1657142543 - 2¹⁸ = 1656880399 is a prime.

It is a super-2 number, since 2×1657142543² = 5492242815641013698, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1657142497 and 1657142506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657142243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371180 + ... + 375617.

It is an arithmetic number, because the mean of its divisors is an integer number (237481764).

Almost surely, 2^1657142543 is an apocalyptic number.

1657142543 is a deficient number, since it is larger than the sum of its proper divisors (242711569).

1657142543 is an equidigital number, since it uses as much as digits as its factorization.

1657142543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747121.

The product of its digits is 100800, while the sum is 38.

The square root of 1657142543 is about 40708.0157094398. The cubic root of 1657142543 is about 1183.3683664472.

The spelling of 1657142543 in words is "one billion, six hundred fifty-seven million, one hundred forty-two thousand, five hundred forty-three".