63215965 has 4 divisors (see below), whose sum is σ = 75859164. Its totient is φ = 50572768.

The previous prime is 63215959. The next prime is 63215989. The reversal of 63215965 is 56951236.

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 9369721 + 53846244 = 3061^2 + 7338^2 .

It is a cyclic number.

It is not a de Polignac number, because 63215965 - 2⁷ = 63215837 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, 6321592 + ... + 6321601.

It is an arithmetic number, because the mean of its divisors is an integer number (18964791).

Almost surely, 2^63215965 is an apocalyptic number.

It is an amenable number.

63215965 is a deficient number, since it is larger than the sum of its proper divisors (12643199).

63215965 is a wasteful number, since it uses less digits than its factorization.

63215965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643198.

The product of its digits is 48600, while the sum is 37.

The square root of 63215965 is about 7950.8468102461. The cubic root of 63215965 is about 398.3598779406.

The spelling of 63215965 in words is "sixty-three million, two hundred fifteen thousand, nine hundred sixty-five".