164388891602 has 8 divisors (see below), whose sum is σ = 265551286476. Its totient is φ = 75871796112.

The previous prime is 164388891593. The next prime is 164388891607. The reversal of 164388891602 is 206198883461.

It is a happy number.

It is a Cunningham number, because it is equal to 405449²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 164388891601 + 1 = 405449^2 + 1^2 .

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

It is a super-2 number, since 2×164388891602² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (164388891607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3161324813 + ... + 3161324864.

Almost surely, 2^164388891602 is an apocalyptic number.

164388891602 is a deficient number, since it is larger than the sum of its proper divisors (101162394874).

164388891602 is a wasteful number, since it uses less digits than its factorization.

164388891602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6322649692.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The spelling of 164388891602 in words is "one hundred sixty-four billion, three hundred eighty-eight million, eight hundred ninety-one thousand, six hundred two".