63959664739 has 4 divisors (see below), whose sum is σ = 64619042824. Its totient is φ = 63300286656.

The previous prime is 63959664677. The next prime is 63959664751. The reversal of 63959664739 is 93746695936.

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

It is a cyclic number.

It is not a de Polignac number, because 63959664739 - 2¹⁹ = 63959140451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63959614739) 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, 329688897 + ... + 329689090.

It is an arithmetic number, because the mean of its divisors is an integer number (16154760706).

Almost surely, 2^63959664739 is an apocalyptic number.

63959664739 is a deficient number, since it is larger than the sum of its proper divisors (659378085).

63959664739 is an equidigital number, since it uses as much as digits as its factorization.

63959664739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659378084.

The product of its digits is 198404640, while the sum is 67.

The spelling of 63959664739 in words is "sixty-three billion, nine hundred fifty-nine million, six hundred sixty-four thousand, seven hundred thirty-nine".