664761601 has 8 divisors (see below), whose sum is σ = 759886784. Its totient is φ = 569676240.

The previous prime is 664761593. The next prime is 664761611. The reversal of 664761601 is 106167466.

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

It is not a de Polignac number, because 664761601 - 2³ = 664761593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664761611) 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, 49546 + ... + 61516.

It is an arithmetic number, because the mean of its divisors is an integer number (94985848).

Almost surely, 2^664761601 is an apocalyptic number.

It is an amenable number.

664761601 is a deficient number, since it is larger than the sum of its proper divisors (95125183).

664761601 is a wasteful number, since it uses less digits than its factorization.

664761601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19911.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 664761601 is about 25782.9711437608. The cubic root of 664761601 is about 872.7475567844.

The spelling of 664761601 in words is "six hundred sixty-four million, seven hundred sixty-one thousand, six hundred one".