245177899217 has 2 divisors, whose sum is σ = 245177899218. Its totient is φ = 245177899216.

The previous prime is 245177899147. The next prime is 245177899231. The reversal of 245177899217 is 712998771542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236024958976 + 9152940241 = 485824^2 + 95671^2 .

It is a cyclic number.

It is not a de Polignac number, because 245177899217 - 2¹⁸ = 245177637073 is a prime.

It is a super-2 number, since 2×245177899217² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 245177899217.

It is not a weakly prime, because it can be changed into another prime (245177899517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122588949608 + 122588949609.

It is an arithmetic number, because the mean of its divisors is an integer number (122588949609).

Almost surely, 2^245177899217 is an apocalyptic number.

It is an amenable number.

245177899217 is a deficient number, since it is larger than the sum of its proper divisors (1).

245177899217 is an equidigital number, since it uses as much as digits as its factorization.

245177899217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17781120, while the sum is 62.

The spelling of 245177899217 in words is "two hundred forty-five billion, one hundred seventy-seven million, eight hundred ninety-nine thousand, two hundred seventeen".