63897874709 has 4 divisors (see below), whose sum is σ = 65456359500. Its totient is φ = 62339389920.

The previous prime is 63897874679. The next prime is 63897874751. The reversal of 63897874709 is 90747879836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4677192100 + 59220682609 = 68390^2 + 243353^2 .

It is a cyclic number.

It is not a de Polignac number, because 63897874709 - 2²⁸ = 63629439253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63897834709) 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, 779242334 + ... + 779242415.

It is an arithmetic number, because the mean of its divisors is an integer number (16364089875).

Almost surely, 2^63897874709 is an apocalyptic number.

It is an amenable number.

63897874709 is a deficient number, since it is larger than the sum of its proper divisors (1558484791).

63897874709 is a wasteful number, since it uses less digits than its factorization.

63897874709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558484790.

The product of its (nonzero) digits is 128024064, while the sum is 68.

The spelling of 63897874709 in words is "sixty-three billion, eight hundred ninety-seven million, eight hundred seventy-four thousand, seven hundred nine".