1253958556645 has 16 divisors (see below), whose sum is σ = 1508724645120. Its totient is φ = 1000517880384.

The previous prime is 1253958556633. The next prime is 1253958556667. The reversal of 1253958556645 is 5466558593521.

It is a cyclic number.

It is not a de Polignac number, because 1253958556645 - 2²¹ = 1253956459493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18472276 + ... + 18540034.

It is an arithmetic number, because the mean of its divisors is an integer number (94295290320).

Almost surely, 2^{1253958556645} is an apocalyptic number.

It is an amenable number.

1253958556645 is a deficient number, since it is larger than the sum of its proper divisors (254766088475).

1253958556645 is an equidigital number, since it uses as much as digits as its factorization.

1253958556645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77484.

The product of its digits is 194400000, while the sum is 64.

The spelling of 1253958556645 in words is "one trillion, two hundred fifty-three billion, nine hundred fifty-eight million, five hundred fifty-six thousand, six hundred forty-five".