63997851 has 8 divisors (see below), whose sum is σ = 85386304. Its totient is φ = 42637320.

The previous prime is 63997849. The next prime is 63997861. The reversal of 63997851 is 15879936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63997851 - 2¹ = 63997849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63997851.

It is not an unprimeable number, because it can be changed into a prime (63997811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 865 + ... + 11346.

It is an arithmetic number, because the mean of its divisors is an integer number (10673288).

Almost surely, 2^63997851 is an apocalyptic number.

63997851 is a deficient number, since it is larger than the sum of its proper divisors (21388453).

63997851 is a wasteful number, since it uses less digits than its factorization.

63997851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13961.

The product of its digits is 408240, while the sum is 48.

The square root of 63997851 is about 7999.8656863725. The cubic root of 63997851 is about 399.9955228666.

The spelling of 63997851 in words is "sixty-three million, nine hundred ninety-seven thousand, eight hundred fifty-one".