1256260545 has 24 divisors (see below), whose sum is σ = 2193423336. Its totient is φ = 665111808.

The previous prime is 1256260513. The next prime is 1256260549. The reversal of 1256260545 is 5450626521.

1256260545 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 2 + 605 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 87441201 + 1168819344 = 9351^2 + 34188^2 .

It is not a de Polignac number, because 1256260545 - 2⁵ = 1256260513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256260549) 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, 95722 + ... + 108051.

It is an arithmetic number, because the mean of its divisors is an integer number (91392639).

Almost surely, 2^1256260545 is an apocalyptic number.

1256260545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1256260545 is a deficient number, since it is larger than the sum of its proper divisors (937162791).

1256260545 is a wasteful number, since it uses less digits than its factorization.

1256260545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203921 (or 203918 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 1256260545 is about 35443.7659539728. The cubic root of 1256260545 is about 1079.0127423430.

The spelling of 1256260545 in words is "one billion, two hundred fifty-six million, two hundred sixty thousand, five hundred forty-five".