164642477 has 8 divisors (see below), whose sum is σ = 167551032. Its totient is φ = 161740800.

The previous prime is 164642473. The next prime is 164642479. The reversal of 164642477 is 774246461.

It can be written as a sum of positive squares in 4 ways, for example, as 24314761 + 140327716 = 4931^2 + 11846^2 .

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 164642477 - 2² = 164642473 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 (164642473) 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, 78077 + ... + 80157.

It is an arithmetic number, because the mean of its divisors is an integer number (20943879).

Almost surely, 2^164642477 is an apocalyptic number.

It is an amenable number.

164642477 is a deficient number, since it is larger than the sum of its proper divisors (2908555).

164642477 is a wasteful number, since it uses less digits than its factorization.

164642477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439.

The product of its digits is 225792, while the sum is 41.

The square root of 164642477 is about 12831.3084679623. The cubic root of 164642477 is about 548.0842183687.

The spelling of 164642477 in words is "one hundred sixty-four million, six hundred forty-two thousand, four hundred seventy-seven".