1657557541 has 4 divisors (see below), whose sum is σ = 1670210784. Its totient is φ = 1644904300.

The previous prime is 1657557527. The next prime is 1657557589. The reversal of 1657557541 is 1457557561.

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: 1457557561 = 47 ⋅31011863.

It is a cyclic number.

It is not a de Polignac number, because 1657557541 - 2⁵ = 1657557509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1657557491 and 1657557500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1657557521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6326425 + ... + 6326686.

It is an arithmetic number, because the mean of its divisors is an integer number (417552696).

Almost surely, 2^1657557541 is an apocalyptic number.

It is an amenable number.

1657557541 is a deficient number, since it is larger than the sum of its proper divisors (12653243).

1657557541 is a wasteful number, since it uses less digits than its factorization.

1657557541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12653242.

The product of its digits is 735000, while the sum is 46.

The square root of 1657557541 is about 40713.1126419978. The cubic root of 1657557541 is about 1183.4671417996.

The spelling of 1657557541 in words is "one billion, six hundred fifty-seven million, five hundred fifty-seven thousand, five hundred forty-one".