63040166721 has 24 divisors (see below), whose sum is σ = 106280488704. Its totient is φ = 35256504960.

The previous prime is 63040166719. The next prime is 63040166741. The reversal of 63040166721 is 12766104036.

It is a happy number.

63040166721 is a `hidden beast` number, since 630 + 4 + 0 + 16 + 6 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 63040166721 - 2¹ = 63040166719 is a prime.

It is a super-2 number, since 2×63040166721² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63040166701) 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, 10642120 + ... + 10648041.

It is an arithmetic number, because the mean of its divisors is an integer number (4428353696).

Almost surely, 2^63040166721 is an apocalyptic number.

It is an amenable number.

63040166721 is a deficient number, since it is larger than the sum of its proper divisors (43240321983).

63040166721 is a wasteful number, since it uses less digits than its factorization.

63040166721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21290221 (or 21290218 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The spelling of 63040166721 in words is "sixty-three billion, forty million, one hundred sixty-six thousand, seven hundred twenty-one".