1255623557 has 8 divisors (see below), whose sum is σ = 1265533920. Its totient is φ = 1245726000.

The previous prime is 1255623541. The next prime is 1255623563. The reversal of 1255623557 is 7553265521.

It is a happy number.

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 1255623557 - 2⁴ = 1255623541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255623857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310883 + ... + 314895.

It is an arithmetic number, because the mean of its divisors is an integer number (158191740).

Almost surely, 2^1255623557 is an apocalyptic number.

It is an amenable number.

1255623557 is a deficient number, since it is larger than the sum of its proper divisors (9910363).

1255623557 is a wasteful number, since it uses less digits than its factorization.

1255623557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6403.

The product of its digits is 315000, while the sum is 41.

The square root of 1255623557 is about 35434.7789184581. The cubic root of 1255623557 is about 1078.8303400612.

The spelling of 1255623557 in words is "one billion, two hundred fifty-five million, six hundred twenty-three thousand, five hundred fifty-seven".