63439000642 has 4 divisors (see below), whose sum is σ = 95158500966. Its totient is φ = 31719500320.

The previous prime is 63439000631. The next prime is 63439000643. The reversal of 63439000642 is 24600093436.

It is a Cunningham number, because it is equal to 251871²+1.

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

It can be written as a sum of positive squares in only one way, i.e., 63439000641 + 1 = 251871^2 + 1^2 .

It is not an unprimeable number, because it can be changed into a prime (63439000643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859750159 + ... + 15859750162.

Almost surely, 2^63439000642 is an apocalyptic number.

63439000642 is a deficient number, since it is larger than the sum of its proper divisors (31719500324).

63439000642 is a wasteful number, since it uses less digits than its factorization.

63439000642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31719500323.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 63439000642 in words is "sixty-three billion, four hundred thirty-nine million, six hundred forty-two", and thus it is an aban number.