164487968506 has 8 divisors (see below), whose sum is σ = 255239951220. Its totient is φ = 79407984768.

The previous prime is 164487968459. The next prime is 164487968509. The reversal of 164487968506 is 605869784461.

It can be written as a sum of positive squares in 2 ways, for example, as 164272143025 + 215825481 = 405305^2 + 14691^2 .

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

It is not an unprimeable number, because it can be changed into a prime (164487968509) 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, 1417999671 + ... + 1417999786.

Almost surely, 2^164487968506 is an apocalyptic number.

164487968506 is a deficient number, since it is larger than the sum of its proper divisors (90751982714).

164487968506 is a wasteful number, since it uses less digits than its factorization.

164487968506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2835999488.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 164487968506 in words is "one hundred sixty-four billion, four hundred eighty-seven million, nine hundred sixty-eight thousand, five hundred six".