1556226745 has 8 divisors (see below), whose sum is σ = 1869044616. Its totient is φ = 1243933056.

The previous prime is 1556226671. The next prime is 1556226761. The reversal of 1556226745 is 5476226551.

It can be written as a sum of positive squares in 4 ways, for example, as 495552121 + 1060674624 = 22261^2 + 32568^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1556226745 - 2¹³ = 1556218553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124482 + ... + 136411.

It is an arithmetic number, because the mean of its divisors is an integer number (233630577).

Almost surely, 2^1556226745 is an apocalyptic number.

It is an amenable number.

1556226745 is a deficient number, since it is larger than the sum of its proper divisors (312817871).

1556226745 is a wasteful number, since it uses less digits than its factorization.

1556226745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262091.

The product of its digits is 504000, while the sum is 43.

The square root of 1556226745 is about 39449.0398488987. The cubic root of 1556226745 is about 1158.8421723609.

The spelling of 1556226745 in words is "one billion, five hundred fifty-six million, two hundred twenty-six thousand, seven hundred forty-five".