63810375081 has 4 divisors (see below), whose sum is σ = 85080500112. Its totient is φ = 42540250052.

The previous prime is 63810375053. The next prime is 63810375119. The reversal of 63810375081 is 18057301836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63810375081 - 2¹⁰ = 63810374057 is a prime.

It is a super-2 number, since 2×63810375081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63810375281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10635062511 + ... + 10635062516.

It is an arithmetic number, because the mean of its divisors is an integer number (21270125028).

Almost surely, 2^63810375081 is an apocalyptic number.

It is an amenable number.

63810375081 is a deficient number, since it is larger than the sum of its proper divisors (21270125031).

63810375081 is a wasteful number, since it uses less digits than its factorization.

63810375081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21270125030.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 63810375081 in words is "sixty-three billion, eight hundred ten million, three hundred seventy-five thousand, eighty-one".