664351501 has 4 divisors (see below), whose sum is σ = 724747104. Its totient is φ = 603955900.

The previous prime is 664351487. The next prime is 664351507. The reversal of 664351501 is 105153466.

664351501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664351501 - 2¹⁷ = 664220429 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 (664351507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30197785 + ... + 30197806.

It is an arithmetic number, because the mean of its divisors is an integer number (181186776).

Almost surely, 2^664351501 is an apocalyptic number.

It is an amenable number.

664351501 is a deficient number, since it is larger than the sum of its proper divisors (60395603).

664351501 is a wasteful number, since it uses less digits than its factorization.

664351501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60395602.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 664351501 is about 25775.0169932049. The cubic root of 664351501 is about 872.5680501270.

The spelling of 664351501 in words is "six hundred sixty-four million, three hundred fifty-one thousand, five hundred one".