164261226651 has 4 divisors (see below), whose sum is σ = 219014968872. Its totient is φ = 109507484432.

The previous prime is 164261226587. The next prime is 164261226659. The reversal of 164261226651 is 156622162461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156622162461 = 3 ⋅52207387487.

It is a cyclic number.

It is not a de Polignac number, because 164261226651 - 2⁶ = 164261226587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164261226659) 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, 27376871106 + ... + 27376871111.

It is an arithmetic number, because the mean of its divisors is an integer number (54753742218).

Almost surely, 2^164261226651 is an apocalyptic number.

164261226651 is a deficient number, since it is larger than the sum of its proper divisors (54753742221).

164261226651 is an equidigital number, since it uses as much as digits as its factorization.

164261226651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54753742220.

The product of its digits is 207360, while the sum is 42.

The spelling of 164261226651 in words is "one hundred sixty-four billion, two hundred sixty-one million, two hundred twenty-six thousand, six hundred fifty-one".