63646121 has 24 divisors (see below), whose sum is σ = 80617152. Its totient is φ = 49183200.

The previous prime is 63646117. The next prime is 63646127. The reversal of 63646121 is 12164636.

It is a happy number.

It is not a de Polignac number, because 63646121 - 2² = 63646117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63646127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137831 + ... + 138291.

It is an arithmetic number, because the mean of its divisors is an integer number (3359048).

Almost surely, 2^63646121 is an apocalyptic number.

It is an amenable number.

63646121 is a deficient number, since it is larger than the sum of its proper divisors (16971031).

63646121 is a wasteful number, since it uses less digits than its factorization.

63646121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 642 counting only the distinct ones).

The product of its digits is 5184, while the sum is 29.

The square root of 63646121 is about 7977.8519038648. The cubic root of 63646121 is about 399.2613890575.

The spelling of 63646121 in words is "sixty-three million, six hundred forty-six thousand, one hundred twenty-one".