164211401778 has 32 divisors (see below), whose sum is σ = 337325069760. Its totient is φ = 53253650880.

The previous prime is 164211401759. The next prime is 164211401789. The reversal of 164211401778 is 877104112461.

It is a super-2 number, since 2×164211401778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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, 4427973 + ... + 4464903.

It is an arithmetic number, because the mean of its divisors is an integer number (10541408430).

Almost surely, 2^164211401778 is an apocalyptic number.

164211401778 is an abundant number, since it is smaller than the sum of its proper divisors (173113667982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

164211401778 is a wasteful number, since it uses less digits than its factorization.

164211401778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57002.

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 164211401778 in words is "one hundred sixty-four billion, two hundred eleven million, four hundred one thousand, seven hundred seventy-eight".