63999225001 has 4 divisors (see below), whose sum is σ = 63999940612. Its totient is φ = 63998509392.

The previous prime is 63999224963. The next prime is 63999225007. The reversal of 63999225001 is 10052299936.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 40382912025 + 23616312976 = 200955^2 + 153676^2 .

It is a cyclic number.

It is not a de Polignac number, because 63999225001 - 2⁹ = 63999224489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63999225007) 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, 200646 + ... + 410191.

It is an arithmetic number, because the mean of its divisors is an integer number (15999985153).

Almost surely, 2^63999225001 is an apocalyptic number.

It is an amenable number.

63999225001 is a deficient number, since it is larger than the sum of its proper divisors (715611).

63999225001 is a wasteful number, since it uses less digits than its factorization.

63999225001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715610.

The product of its (nonzero) digits is 262440, while the sum is 46.

The spelling of 63999225001 in words is "sixty-three billion, nine hundred ninety-nine million, two hundred twenty-five thousand, one".