664666101 has 16 divisors (see below), whose sum is σ = 1074208320. Its totient is φ = 402827760.

The previous prime is 664666099. The next prime is 664666103. The reversal of 664666101 is 101666466.

It is an interprime number because it is at equal distance from previous prime (664666099) and next prime (664666103).

It is not a de Polignac number, because 664666101 - 2¹ = 664666099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664666103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1118670 + ... + 1119263.

It is an arithmetic number, because the mean of its divisors is an integer number (67138020).

Almost surely, 2^664666101 is an apocalyptic number.

It is an amenable number.

664666101 is a deficient number, since it is larger than the sum of its proper divisors (409542219).

664666101 is a wasteful number, since it uses less digits than its factorization.

664666101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237953 (or 2237947 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 664666101 is about 25781.1190796676. The cubic root of 664666101 is about 872.7057616591.

The spelling of 664666101 in words is "six hundred sixty-four million, six hundred sixty-six thousand, one hundred one".