1253974793520 has 40 divisors (see below), whose sum is σ = 3887321860656. Its totient is φ = 334393278208.

The previous prime is 1253974793507. The next prime is 1253974793549. The reversal of 1253974793520 is 253974793521.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2612447247 + ... + 2612447726.

Almost surely, 2^{1253974793520} is an apocalyptic number.

1253974793520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253974793520 is an abundant number, since it is smaller than the sum of its proper divisors (2633347067136).

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

1253974793520 is a wasteful number, since it uses less digits than its factorization.

1253974793520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5224894989 (or 5224894983 counting only the distinct ones).

The product of its (nonzero) digits is 14288400, while the sum is 57.

Subtracting from 1253974793520 its reverse (253974793521), we obtain a palindrome (999999999999).

The spelling of 1253974793520 in words is "one trillion, two hundred fifty-three billion, nine hundred seventy-four million, seven hundred ninety-three thousand, five hundred twenty".