3968136561 has 16 divisors (see below), whose sum is σ = 5336424000. Its totient is φ = 2622704448.

The previous prime is 3968136551. The next prime is 3968136563. The reversal of 3968136561 is 1656318693.

It is not a de Polignac number, because 3968136561 - 2¹⁵ = 3968103793 is a prime.

It is a super-2 number, since 2×3968136561² = 31492215533489813442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3968136561.

It is not an unprimeable number, because it can be changed into a prime (3968136563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236395 + ... + 252623.

It is an arithmetic number, because the mean of its divisors is an integer number (333526500).

Almost surely, 2^3968136561 is an apocalyptic number.

It is an amenable number.

3968136561 is a deficient number, since it is larger than the sum of its proper divisors (1368287439).

3968136561 is a wasteful number, since it uses less digits than its factorization.

3968136561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16928.

The product of its digits is 699840, while the sum is 48.

The square root of 3968136561 is about 62993.1469367899. The cubic root of 3968136561 is about 1583.1748054123.

The spelling of 3968136561 in words is "three billion, nine hundred sixty-eight million, one hundred thirty-six thousand, five hundred sixty-one".