63191890866 has 48 divisors (see below), whose sum is σ = 137078044416. Its totient is φ = 19411748928.

The previous prime is 63191890859. The next prime is 63191890873. The reversal of 63191890866 is 66809819136.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (63191890859) and next prime (63191890873).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 570751 + ... + 672413.

It is an arithmetic number, because the mean of its divisors is an integer number (2855792592).

Almost surely, 2^63191890866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63191890866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68539022208).

63191890866 is an abundant number, since it is smaller than the sum of its proper divisors (73886153550).

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

63191890866 is a wasteful number, since it uses less digits than its factorization.

63191890866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102307 (or 102294 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 63191890866 in words is "sixty-three billion, one hundred ninety-one million, eight hundred ninety thousand, eight hundred sixty-six".