245520407217 has 4 divisors (see below), whose sum is σ = 327360542960. Its totient is φ = 163680271476.

The previous prime is 245520407207. The next prime is 245520407269. The reversal of 245520407217 is 712704025542.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 245520407217 - 2⁴ = 245520407201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245520407207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40920067867 + ... + 40920067872.

It is an arithmetic number, because the mean of its divisors is an integer number (81840135740).

Almost surely, 2^245520407217 is an apocalyptic number.

It is an amenable number.

245520407217 is a deficient number, since it is larger than the sum of its proper divisors (81840135743).

245520407217 is an equidigital number, since it uses as much as digits as its factorization.

245520407217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81840135742.

The product of its (nonzero) digits is 156800, while the sum is 39.

The spelling of 245520407217 in words is "two hundred forty-five billion, five hundred twenty million, four hundred seven thousand, two hundred seventeen".