1556442157 has 6 divisors (see below), whose sum is σ = 1653383498. Its totient is φ = 1464886464.

The previous prime is 1556442143. The next prime is 1556442161. The reversal of 1556442157 is 7512446551.

It can be written as a sum of positive squares in 3 ways, for example, as 624300196 + 932141961 = 24986^2 + 30531^2 .

It is not a de Polignac number, because 1556442157 - 2⁷ = 1556442029 is a prime.

It is a super-3 number, since 3×1556442157³ (a number of 29 digits) contains 333 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 (1556442127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2692518 + ... + 2693095.

Almost surely, 2^1556442157 is an apocalyptic number.

1556442157 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1556442157 is a deficient number, since it is larger than the sum of its proper divisors (96941341).

1556442157 is an equidigital number, since it uses as much as digits as its factorization.

1556442157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385647 (or 5385630 counting only the distinct ones).

The product of its digits is 168000, while the sum is 40.

The square root of 1556442157 is about 39451.7700109894. The cubic root of 1556442157 is about 1158.8956386470.

The spelling of 1556442157 in words is "one billion, five hundred fifty-six million, four hundred forty-two thousand, one hundred fifty-seven".