1556122945 has 16 divisors (see below), whose sum is σ = 2016781200. Its totient is φ = 1145827584.

The previous prime is 1556122907. The next prime is 1556122951. The reversal of 1556122945 is 5492216551.

It can be written as a sum of positive squares in 8 ways, for example, as 199600384 + 1356522561 = 14128^2 + 36831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1556122945 - 2¹⁷ = 1555991873 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1556122898 and 1556122907.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11614 + ... + 56983.

It is an arithmetic number, because the mean of its divisors is an integer number (126048825).

Almost surely, 2^1556122945 is an apocalyptic number.

It is an amenable number.

1556122945 is a deficient number, since it is larger than the sum of its proper divisors (460658255).

1556122945 is a wasteful number, since it uses less digits than its factorization.

1556122945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68964.

The product of its digits is 108000, while the sum is 40.

The square root of 1556122945 is about 39447.7242055863. The cubic root of 1556122945 is about 1158.8164069441.

The spelling of 1556122945 in words is "one billion, five hundred fifty-six million, one hundred twenty-two thousand, nine hundred forty-five".