3951861636667 has 24 divisors (see below), whose sum is σ = 4740374070432. Its totient is φ = 3282807024000.

The previous prime is 3951861636563. The next prime is 3951861636677. The reversal of 3951861636667 is 7666361681593.

It is not a de Polignac number, because 3951861636667 - 2¹¹ = 3951861634619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3951861636677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6210148 + ... + 6816865.

It is an arithmetic number, because the mean of its divisors is an integer number (197515586268).

Almost surely, 2^{3951861636667} is an apocalyptic number.

3951861636667 is a deficient number, since it is larger than the sum of its proper divisors (788512433765).

3951861636667 is a wasteful number, since it uses less digits than its factorization.

3951861636667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13027219 (or 13027212 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 67.

The spelling of 3951861636667 in words is "three trillion, nine hundred fifty-one billion, eight hundred sixty-one million, six hundred thirty-six thousand, six hundred sixty-seven".