642732773426 has 16 divisors (see below), whose sum is σ = 980751634200. Its totient is φ = 315862012800.

The previous prime is 642732773413. The next prime is 642732773429. The reversal of 642732773426 is 624377237246.

642732773426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 621415313401 + 21317460025 = 788299^2 + 146005^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642732773429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11584901 + ... + 11640248.

Almost surely, 2^642732773426 is an apocalyptic number.

642732773426 is a deficient number, since it is larger than the sum of its proper divisors (338018860774).

642732773426 is a wasteful number, since it uses less digits than its factorization.

642732773426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23225389.

The product of its digits is 14224896, while the sum is 53.

The spelling of 642732773426 in words is "six hundred forty-two billion, seven hundred thirty-two million, seven hundred seventy-three thousand, four hundred twenty-six".