245671678721 has 12 divisors (see below), whose sum is σ = 285804759060. Its totient is φ = 210558468960.

The previous prime is 245671678699. The next prime is 245671678739. The reversal of 245671678721 is 127876176542.

It can be written as a sum of positive squares in 2 ways, for example, as 154323265600 + 91348413121 = 392840^2 + 302239^2 .

It is not a de Polignac number, because 245671678721 - 2¹⁰ = 245671677697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (245671677721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417731 + ... + 815991.

It is an arithmetic number, because the mean of its divisors is an integer number (23817063255).

Almost surely, 2^245671678721 is an apocalyptic number.

It is an amenable number.

245671678721 is a deficient number, since it is larger than the sum of its proper divisors (40133080339).

245671678721 is a wasteful number, since it uses less digits than its factorization.

245671678721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410864 (or 410857 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 56.

The spelling of 245671678721 in words is "two hundred forty-five billion, six hundred seventy-one million, six hundred seventy-eight thousand, seven hundred twenty-one".