1556245505 has 4 divisors (see below), whose sum is σ = 1867494612. Its totient is φ = 1244996400.

The previous prime is 1556245499. The next prime is 1556245513. The reversal of 1556245505 is 5055426551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5055426551 = 7 ⋅722203793.

It can be written as a sum of positive squares in 2 ways, for example, as 554649601 + 1001595904 = 23551^2 + 31648^2 .

It is not a de Polignac number, because 1556245505 - 2¹² = 1556241409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155624546 + ... + 155624555.

It is an arithmetic number, because the mean of its divisors is an integer number (466873653).

Almost surely, 2^1556245505 is an apocalyptic number.

It is an amenable number.

1556245505 is a deficient number, since it is larger than the sum of its proper divisors (311249107).

1556245505 is an equidigital number, since it uses as much as digits as its factorization.

1556245505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311249106.

The product of its (nonzero) digits is 150000, while the sum is 38.

The square root of 1556245505 is about 39449.2776232975. The cubic root of 1556245505 is about 1158.8468288785.

The spelling of 1556245505 in words is "one billion, five hundred fifty-six million, two hundred forty-five thousand, five hundred five".