3968218251 has 72 divisors (see below), whose sum is σ = 6307951104. Its totient is φ = 2401781760.

The previous prime is 3968218249. The next prime is 3968218253. The reversal of 3968218251 is 1528128693.

3968218251 is a `hidden beast` number, since 396 + 8 + 2 + 1 + 8 + 251 = 666.

It is an interprime number because it is at equal distance from previous prime (3968218249) and next prime (3968218253).

It is not a de Polignac number, because 3968218251 - 2¹ = 3968218249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3968218197 and 3968218206.

It is not an unprimeable number, because it can be changed into a prime (3968218253) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13543261 + ... + 13543553.

It is an arithmetic number, because the mean of its divisors is an integer number (87610432).

Almost surely, 2^3968218251 is an apocalyptic number.

3968218251 is a deficient number, since it is larger than the sum of its proper divisors (2339732853).

3968218251 is a wasteful number, since it uses less digits than its factorization.

3968218251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 481 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 3968218251 is about 62993.7953373187. The cubic root of 3968218251 is about 1583.1856693414.

The spelling of 3968218251 in words is "three billion, nine hundred sixty-eight million, two hundred eighteen thousand, two hundred fifty-one".