164640751 has 8 divisors (see below), whose sum is σ = 179740800. Its totient is φ = 149562840.

The previous prime is 164640731. The next prime is 164640761. The reversal of 164640751 is 157046461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164640751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164640731) 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 7 ways as a sum of consecutive naturals, for example, 12630 + ... + 22108.

It is an arithmetic number, because the mean of its divisors is an integer number (22467600).

Almost surely, 2^164640751 is an apocalyptic number.

164640751 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

164640751 is a deficient number, since it is larger than the sum of its proper divisors (15100049).

164640751 is a wasteful number, since it uses less digits than its factorization.

164640751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11069.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 164640751 is about 12831.2412104208. The cubic root of 164640751 is about 548.0823031143.

The spelling of 164640751 in words is "one hundred sixty-four million, six hundred forty thousand, seven hundred fifty-one".