1253123803640 has 32 divisors (see below), whose sum is σ = 2985383180880. Its totient is φ = 471764255232.

The previous prime is 1253123803601. The next prime is 1253123803667. The reversal of 1253123803640 is 463083213521.

It is a junction number, because it is equal to n+sod(n) for n = 1253123803594 and 1253123803603.

It is a congruent number.

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, 921413882 + ... + 921415241.

Almost surely, 2^{1253123803640} is an apocalyptic number.

1253123803640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253123803640 is an abundant number, since it is smaller than the sum of its proper divisors (1732259377240).

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

1253123803640 is a wasteful number, since it uses less digits than its factorization.

1253123803640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1842829151 (or 1842829147 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 1253123803640 in words is "one trillion, two hundred fifty-three billion, one hundred twenty-three million, eight hundred three thousand, six hundred forty".