63505861 has 8 divisors (see below), whose sum is σ = 64425240. Its totient is φ = 62591232.

The previous prime is 63505859. The next prime is 63505901. The reversal of 63505861 is 16850536.

It can be written as a sum of positive squares in 4 ways, for example, as 12383361 + 51122500 = 3519^2 + 7150^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63505861 - 2¹ = 63505859 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 (63505811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32241 + ... + 34153.

It is an arithmetic number, because the mean of its divisors is an integer number (8053155).

Almost surely, 2^63505861 is an apocalyptic number.

It is an amenable number.

63505861 is a deficient number, since it is larger than the sum of its proper divisors (919379).

63505861 is a wasteful number, since it uses less digits than its factorization.

63505861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2375.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 63505861 is about 7969.0564686166. The cubic root of 63505861 is about 398.9678828762.

The spelling of 63505861 in words is "sixty-three million, five hundred five thousand, eight hundred sixty-one".