63695521 has 4 divisors (see below), whose sum is σ = 63716544. Its totient is φ = 63674500.

The previous prime is 63695497. The next prime is 63695557. The reversal of 63695521 is 12559636.

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 63695521 - 2¹⁹ = 63171233 is a prime.

It is a super-2 number, since 2×63695521² = 8114238790922882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63695561) 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, 5005 + ... + 12346.

It is an arithmetic number, because the mean of its divisors is an integer number (15929136).

Almost surely, 2^63695521 is an apocalyptic number.

It is an amenable number.

63695521 is a deficient number, since it is larger than the sum of its proper divisors (21023).

63695521 is a wasteful number, since it uses less digits than its factorization.

63695521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21022.

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

The square root of 63695521 is about 7980.9473748422. The cubic root of 63695521 is about 399.3646601425.

The spelling of 63695521 in words is "sixty-three million, six hundred ninety-five thousand, five hundred twenty-one".