63911997 has 20 divisors (see below), whose sum is σ = 95727456. Its totient is φ = 42494760.

The previous prime is 63911983. The next prime is 63912019. The reversal of 63911997 is 79911936.

63911997 is a `hidden beast` number, since 639 + 1 + 1 + 9 + 9 + 7 = 666.

It is not a de Polignac number, because 63911997 - 2¹¹ = 63909949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63911977) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 38968 + ... + 40574.

Almost surely, 2^63911997 is an apocalyptic number.

It is an amenable number.

63911997 is a deficient number, since it is larger than the sum of its proper divisors (31815459).

63911997 is a wasteful number, since it uses less digits than its factorization.

63911997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110 (or 2101 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 63911997 is about 7994.4979204450. The cubic root of 63911997 is about 399.8165763189.

The spelling of 63911997 in words is "sixty-three million, nine hundred eleven thousand, nine hundred ninety-seven".