1253358394965 has 32 divisors (see below), whose sum is σ = 2228238979200. Its totient is φ = 668443927680.

The previous prime is 1253358394961. The next prime is 1253358394997. The reversal of 1253358394965 is 5694938533521.

1253358394965 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 3 + 583 + 9 + 49 + 6 + 5 = 666.

It is not a de Polignac number, because 1253358394965 - 2² = 1253358394961 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1253358394961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12522841 + ... + 12622529.

It is an arithmetic number, because the mean of its divisors is an integer number (69632468100).

Almost surely, 2^{1253358394965} is an apocalyptic number.

1253358394965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1253358394965 is a deficient number, since it is larger than the sum of its proper divisors (974880584235).

1253358394965 is an equidigital number, since it uses as much as digits as its factorization.

1253358394965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192834 (or 192828 counting only the distinct ones).

The product of its digits is 104976000, while the sum is 63.

The spelling of 1253358394965 in words is "one trillion, two hundred fifty-three billion, three hundred fifty-eight million, three hundred ninety-four thousand, nine hundred sixty-five".