1557260545 has 4 divisors (see below), whose sum is σ = 1868712660. Its totient is φ = 1245808432.

The previous prime is 1557260543. The next prime is 1557260569. The reversal of 1557260545 is 5450627551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1187698369 + 369562176 = 34463^2 + 19224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1557260545 - 2¹ = 1557260543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1557260498 and 1557260507.

It is not an unprimeable number, because it can be changed into a prime (1557260543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155726050 + ... + 155726059.

It is an arithmetic number, because the mean of its divisors is an integer number (467178165).

Almost surely, 2^1557260545 is an apocalyptic number.

It is an amenable number.

1557260545 is a deficient number, since it is larger than the sum of its proper divisors (311452115).

1557260545 is an equidigital number, since it uses as much as digits as its factorization.

1557260545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311452114.

The product of its (nonzero) digits is 210000, while the sum is 40.

The square root of 1557260545 is about 39462.1406540497. The cubic root of 1557260545 is about 1159.0987214917.

The spelling of 1557260545 in words is "one billion, five hundred fifty-seven million, two hundred sixty thousand, five hundred forty-five".