63818861 has 4 divisors (see below), whose sum is σ = 64049532. Its totient is φ = 63588192.

The previous prime is 63818851. The next prime is 63818869. The reversal of 63818861 is 16881836.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8970025 + 54848836 = 2995^2 + 7406^2 .

It is a cyclic number.

It is not a de Polignac number, because 63818861 - 2¹⁴ = 63802477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63818869) 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, 114920 + ... + 115473.

It is an arithmetic number, because the mean of its divisors is an integer number (16012383).

Almost surely, 2^63818861 is an apocalyptic number.

It is an amenable number.

63818861 is a deficient number, since it is larger than the sum of its proper divisors (230671).

63818861 is a wasteful number, since it uses less digits than its factorization.

63818861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230670.

The product of its digits is 55296, while the sum is 41.

The square root of 63818861 is about 7988.6707905633. The cubic root of 63818861 is about 399.6222704967.

The spelling of 63818861 in words is "sixty-three million, eight hundred eighteen thousand, eight hundred sixty-one".