1255515415 has 64 divisors (see below), whose sum is σ = 1959552000. Its totient is φ = 749306880.

The previous prime is 1255515379. The next prime is 1255515439. The reversal of 1255515415 is 5145155521.

It is not a de Polignac number, because 1255515415 - 2²⁷ = 1121297687 is a prime.

Its product of digits (25000) is a multiple of the sum of its prime divisors (1000).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1551531 + ... + 1552339.

It is an arithmetic number, because the mean of its divisors is an integer number (30618000).

Almost surely, 2^1255515415 is an apocalyptic number.

1255515415 is a deficient number, since it is larger than the sum of its proper divisors (704036585).

1255515415 is a wasteful number, since it uses less digits than its factorization.

1255515415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000.

The product of its digits is 25000, while the sum is 34.

The square root of 1255515415 is about 35433.2529553808. The cubic root of 1255515415 is about 1078.7993673439.

The spelling of 1255515415 in words is "one billion, two hundred fifty-five million, five hundred fifteen thousand, four hundred fifteen".