63365721 has 16 divisors (see below), whose sum is σ = 85688064. Its totient is φ = 41647824.

The previous prime is 63365693. The next prime is 63365737. The reversal of 63365721 is 12756336.

It is not a de Polignac number, because 63365721 - 2⁷ = 63365593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63365021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98226 + ... + 98868.

It is an arithmetic number, because the mean of its divisors is an integer number (5355504).

Almost surely, 2^63365721 is an apocalyptic number.

It is an amenable number.

63365721 is a deficient number, since it is larger than the sum of its proper divisors (22322343).

63365721 is a wasteful number, since it uses less digits than its factorization.

63365721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060.

The product of its digits is 22680, while the sum is 33.

The square root of 63365721 is about 7960.2588525751. The cubic root of 63365721 is about 398.6741958803.

The spelling of 63365721 in words is "sixty-three million, three hundred sixty-five thousand, seven hundred twenty-one".