639979642153 has 4 divisors (see below), whose sum is σ = 640014391120. Its totient is φ = 639944893188.

The previous prime is 639979642103. The next prime is 639979642163. The reversal of 639979642153 is 351246979936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 639979642153 - 2¹³ = 639979633961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639979642103) 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, 17346843 + ... + 17383696.

It is an arithmetic number, because the mean of its divisors is an integer number (160003597780).

Almost surely, 2^639979642153 is an apocalyptic number.

It is an amenable number.

639979642153 is a deficient number, since it is larger than the sum of its proper divisors (34748967).

639979642153 is a wasteful number, since it uses less digits than its factorization.

639979642153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34748966.

The product of its digits is 66134880, while the sum is 64.

The spelling of 639979642153 in words is "six hundred thirty-nine billion, nine hundred seventy-nine million, six hundred forty-two thousand, one hundred fifty-three".