642725748326 has 4 divisors (see below), whose sum is σ = 964088622492. Its totient is φ = 321362874162.

The previous prime is 642725748311. The next prime is 642725748377. The reversal of 642725748326 is 623847527246.

642725748326 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-4 number, since 4×642725748326⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160681437080 + ... + 160681437083.

It is an arithmetic number, because the mean of its divisors is an integer number (241022155623).

Almost surely, 2^642725748326 is an apocalyptic number.

642725748326 is a deficient number, since it is larger than the sum of its proper divisors (321362874166).

642725748326 is a wasteful number, since it uses less digits than its factorization.

642725748326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321362874165.

The product of its digits is 27095040, while the sum is 56.

The spelling of 642725748326 in words is "six hundred forty-two billion, seven hundred twenty-five million, seven hundred forty-eight thousand, three hundred twenty-six".