1556137345 has 12 divisors (see below), whose sum is σ = 2172241044. Its totient is φ = 1067065440.

The previous prime is 1556137291. The next prime is 1556137367. The reversal of 1556137345 is 5437316551.

It can be written as a sum of positive squares in 2 ways, for example, as 637865536 + 918271809 = 25256^2 + 30303^2 .

It is not a de Polignac number, because 1556137345 - 2²⁵ = 1522582913 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1556137298 and 1556137307.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3175546 + ... + 3176035.

It is an arithmetic number, because the mean of its divisors is an integer number (181020087).

Almost surely, 2^1556137345 is an apocalyptic number.

It is an amenable number.

1556137345 is a deficient number, since it is larger than the sum of its proper divisors (616103699).

1556137345 is an equidigital number, since it uses as much as digits as its factorization.

1556137345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6351600 (or 6351593 counting only the distinct ones).

The product of its digits is 189000, while the sum is 40.

The square root of 1556137345 is about 39447.9067251990. The cubic root of 1556137345 is about 1158.8199814057.

The spelling of 1556137345 in words is "one billion, five hundred fifty-six million, one hundred thirty-seven thousand, three hundred forty-five".