64166945 has 8 divisors (see below), whose sum is σ = 77337960. Its totient is φ = 51108480.

The previous prime is 64166887. The next prime is 64166969. The reversal of 64166945 is 54966146.

It can be written as a sum of positive squares in 4 ways, for example, as 27793984 + 36372961 = 5272^2 + 6031^2 .

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

It is not a de Polignac number, because 64166945 - 2¹⁰ = 64165921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26876 + ... + 29165.

It is an arithmetic number, because the mean of its divisors is an integer number (9667245).

Almost surely, 2^64166945 is an apocalyptic number.

It is an amenable number.

64166945 is a deficient number, since it is larger than the sum of its proper divisors (13171015).

64166945 is a wasteful number, since it uses less digits than its factorization.

64166945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56275.

The product of its digits is 155520, while the sum is 41.

The square root of 64166945 is about 8010.4272670064. The cubic root of 64166945 is about 400.3475001051.

The spelling of 64166945 in words is "sixty-four million, one hundred sixty-six thousand, nine hundred forty-five".