164647661 has 8 divisors (see below), whose sum is σ = 166515360. Its totient is φ = 162786672.

The previous prime is 164647649. The next prime is 164647699. The reversal of 164647661 is 166746461.

164647661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 164647661 - 2²² = 160453357 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 (164647621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60026 + ... + 62708.

It is an arithmetic number, because the mean of its divisors is an integer number (20814420).

Almost surely, 2^164647661 is an apocalyptic number.

It is an amenable number.

164647661 is a deficient number, since it is larger than the sum of its proper divisors (1867699).

164647661 is a wasteful number, since it uses less digits than its factorization.

164647661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355.

The product of its digits is 145152, while the sum is 41.

The square root of 164647661 is about 12831.5104722710. The cubic root of 164647661 is about 548.0899707092.

The spelling of 164647661 in words is "one hundred sixty-four million, six hundred forty-seven thousand, six hundred sixty-one".