1245450656173 has 2 divisors, whose sum is σ = 1245450656174. Its totient is φ = 1245450656172.

The previous prime is 1245450656147. The next prime is 1245450656249. The reversal of 1245450656173 is 3716560545421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1227836854084 + 17613802089 = 1108078^2 + 132717^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245450656173 - 2³³ = 1236860721581 is a prime.

It is a super-2 number, since 2×1245450656173² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245450656143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622725328086 + 622725328087.

It is an arithmetic number, because the mean of its divisors is an integer number (622725328087).

Almost surely, 2^{1245450656173} is an apocalyptic number.

It is an amenable number.

1245450656173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245450656173 is an equidigital number, since it uses as much as digits as its factorization.

1245450656173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024000, while the sum is 49.

The spelling of 1245450656173 in words is "one trillion, two hundred forty-five billion, four hundred fifty million, six hundred fifty-six thousand, one hundred seventy-three".