642445063 has 4 divisors (see below), whose sum is σ = 691863928. Its totient is φ = 593026200.

The previous prime is 642445061. The next prime is 642445087. The reversal of 642445063 is 360544246.

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

It is not a de Polignac number, because 642445063 - 2¹ = 642445061 is a prime.

It is the 25347-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642445061) by changing a digit.

It is a nontrivial repunit in base 25346.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24709413 + ... + 24709438.

It is an arithmetic number, because the mean of its divisors is an integer number (172965982).

Almost surely, 2^642445063 is an apocalyptic number.

642445063 is a deficient number, since it is larger than the sum of its proper divisors (49418865).

642445063 is a wasteful number, since it uses less digits than its factorization.

642445063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49418864.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 642445063 is about 25346.5000147949. The cubic root of 642445063 is about 862.8699248570.

The spelling of 642445063 in words is "six hundred forty-two million, four hundred forty-five thousand, sixty-three".