63781450885 has 4 divisors (see below), whose sum is σ = 76537741068. Its totient is φ = 51025160704.

The previous prime is 63781450879. The next prime is 63781450891. The reversal of 63781450885 is 58805418736.

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

It is an interprime number because it is at equal distance from previous prime (63781450879) and next prime (63781450891).

It can be written as a sum of positive squares in 2 ways, for example, as 37407041281 + 26374409604 = 193409^2 + 162402^2 .

It is a cyclic number.

It is not a de Polignac number, because 63781450885 - 2⁹ = 63781450373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6378145084 + ... + 6378145093.

It is an arithmetic number, because the mean of its divisors is an integer number (19134435267).

Almost surely, 2^63781450885 is an apocalyptic number.

It is an amenable number.

63781450885 is a deficient number, since it is larger than the sum of its proper divisors (12756290183).

63781450885 is a wasteful number, since it uses less digits than its factorization.

63781450885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12756290182.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 63781450885 in words is "sixty-three billion, seven hundred eighty-one million, four hundred fifty thousand, eight hundred eighty-five".