245217657 has 16 divisors (see below), whose sum is σ = 337928192. Its totient is φ = 158006160.

The previous prime is 245217653. The next prime is 245217701. The reversal of 245217657 is 756712542.

It is not a de Polignac number, because 245217657 - 2² = 245217653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245217653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122418 + ... + 124404.

It is an arithmetic number, because the mean of its divisors is an integer number (21120512).

Almost surely, 2^245217657 is an apocalyptic number.

It is an amenable number.

245217657 is a deficient number, since it is larger than the sum of its proper divisors (92710535).

245217657 is a wasteful number, since it uses less digits than its factorization.

245217657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348.

The product of its digits is 117600, while the sum is 39.

The square root of 245217657 is about 15659.4270968002. The cubic root of 245217657 is about 625.9177191137.

The spelling of 245217657 in words is "two hundred forty-five million, two hundred seventeen thousand, six hundred fifty-seven".