664261652 has 6 divisors (see below), whose sum is σ = 1162457898. Its totient is φ = 332130824.

The previous prime is 664261639. The next prime is 664261657. The reversal of 664261652 is 256162466.

664261652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 462508036 + 201753616 = 21506^2 + 14204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664261657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83032703 + ... + 83032710.

It is an arithmetic number, because the mean of its divisors is an integer number (193742983).

Almost surely, 2^664261652 is an apocalyptic number.

It is an amenable number.

664261652 is a deficient number, since it is larger than the sum of its proper divisors (498196246).

664261652 is a wasteful number, since it uses less digits than its factorization.

664261652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166065417 (or 166065415 counting only the distinct ones).

The product of its digits is 103680, while the sum is 38.

The square root of 664261652 is about 25773.2739868260. The cubic root of 664261652 is about 872.5287120652.

The spelling of 664261652 in words is "six hundred sixty-four million, two hundred sixty-one thousand, six hundred fifty-two".