63439251906 has 16 divisors (see below), whose sum is σ = 126895204800. Its totient is φ = 21143633808.

The previous prime is 63439251893. The next prime is 63439251983. The reversal of 63439251906 is 60915293436.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646221 + ... + 737888.

It is an arithmetic number, because the mean of its divisors is an integer number (7930950300).

Almost surely, 2^63439251906 is an apocalyptic number.

63439251906 is an abundant number, since it is smaller than the sum of its proper divisors (63455952894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63439251906 is a wasteful number, since it uses less digits than its factorization.

63439251906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391753.

The product of its (nonzero) digits is 1049760, while the sum is 48.

The spelling of 63439251906 in words is "sixty-three billion, four hundred thirty-nine million, two hundred fifty-one thousand, nine hundred six".