1557103657 has 4 divisors (see below), whose sum is σ = 1624803840. Its totient is φ = 1489403476.

The previous prime is 1557103631. The next prime is 1557103663. The reversal of 1557103657 is 7563017551.

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.

It is a cyclic number.

It is not a de Polignac number, because 1557103657 - 2¹⁹ = 1556579369 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1557103607) 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, 33850057 + ... + 33850102.

It is an arithmetic number, because the mean of its divisors is an integer number (406200960).

Almost surely, 2^1557103657 is an apocalyptic number.

It is an amenable number.

1557103657 is a deficient number, since it is larger than the sum of its proper divisors (67700183).

1557103657 is an equidigital number, since it uses as much as digits as its factorization.

1557103657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67700182.

The product of its (nonzero) digits is 110250, while the sum is 40.

The square root of 1557103657 is about 39460.1527746662. The cubic root of 1557103657 is about 1159.0597952744.

The spelling of 1557103657 in words is "one billion, five hundred fifty-seven million, one hundred three thousand, six hundred fifty-seven".