1253645568 has 108 divisors (see below), whose sum is σ = 4130989408. Its totient is φ = 358179840.

The previous prime is 1253645543. The next prime is 1253645573. The reversal of 1253645568 is 8655463521.

1253645568 is a `hidden beast` number, since 1 + 2 + 536 + 4 + 55 + 68 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22738 + ... + 54993.

Almost surely, 2^1253645568 is an apocalyptic number.

1253645568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1253645568 is an abundant number, since it is smaller than the sum of its proper divisors (2877343840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1253645568 is an equidigital number, since it uses as much as digits as its factorization.

1253645568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77760 (or 77743 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 1253645568 is about 35406.8576408582. The cubic root of 1253645568 is about 1078.2635470292.

The spelling of 1253645568 in words is "one billion, two hundred fifty-three million, six hundred forty-five thousand, five hundred sixty-eight".