63968951 has 4 divisors (see below), whose sum is σ = 64845312. Its totient is φ = 63092592.

The previous prime is 63968923. The next prime is 63968959. The reversal of 63968951 is 15986936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63968951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63968896 and 63968905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63968959) 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, 438071 + ... + 438216.

It is an arithmetic number, because the mean of its divisors is an integer number (16211328).

Almost surely, 2^63968951 is an apocalyptic number.

63968951 is a deficient number, since it is larger than the sum of its proper divisors (876361).

63968951 is an equidigital number, since it uses as much as digits as its factorization.

63968951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876360.

The product of its digits is 349920, while the sum is 47.

The square root of 63968951 is about 7998.0592020815. The cubic root of 63968951 is about 399.9353041200.

The spelling of 63968951 in words is "sixty-three million, nine hundred sixty-eight thousand, nine hundred fifty-one".