3968861555 has 8 divisors (see below), whose sum is σ = 4926862800. Its totient is φ = 3065603296.

The previous prime is 3968861551. The next prime is 3968861557. The reversal of 3968861555 is 5551688693.

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

It is a cyclic number.

It is not a de Polignac number, because 3968861555 - 2² = 3968861551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3968861555.

It is not an unprimeable number, because it can be changed into a prime (3968861551) 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, 13685585 + ... + 13685874.

It is an arithmetic number, because the mean of its divisors is an integer number (615857850).

Almost surely, 2^3968861555 is an apocalyptic number.

3968861555 is a deficient number, since it is larger than the sum of its proper divisors (958001245).

3968861555 is a wasteful number, since it uses less digits than its factorization.

3968861555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27371493.

The product of its digits is 7776000, while the sum is 56.

The square root of 3968861555 is about 62998.9012205769. The cubic root of 3968861555 is about 1583.2712169414.

The spelling of 3968861555 in words is "three billion, nine hundred sixty-eight million, eight hundred sixty-one thousand, five hundred fifty-five".