1256245155 has 24 divisors (see below), whose sum is σ = 2375446320. Its totient is φ = 609088320.

The previous prime is 1256245153. The next prime is 1256245183. The reversal of 1256245155 is 5515426521.

1256245155 is a `hidden beast` number, since 1 + 2 + 562 + 45 + 1 + 55 = 666.

It is not a de Polignac number, because 1256245155 - 2¹ = 1256245153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256245153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1268440 + ... + 1269429.

It is an arithmetic number, because the mean of its divisors is an integer number (98976930).

Almost surely, 2^1256245155 is an apocalyptic number.

1256245155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1256245155 is a deficient number, since it is larger than the sum of its proper divisors (1119201165).

1256245155 is a wasteful number, since it uses less digits than its factorization.

1256245155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537891 (or 2537888 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 1256245155 is about 35443.5488488385. The cubic root of 1256245155 is about 1079.0083361249.

The spelling of 1256245155 in words is "one billion, two hundred fifty-six million, two hundred forty-five thousand, one hundred fifty-five".