664010121 has 4 divisors (see below), whose sum is σ = 885346832. Its totient is φ = 442673412.

The previous prime is 664010101. The next prime is 664010141. The reversal of 664010121 is 121010466.

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 an interprime number because it is at equal distance from previous prime (664010101) and next prime (664010141).

It is not a de Polignac number, because 664010121 - 2²² = 659815817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664010101) 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, 110668351 + ... + 110668356.

It is an arithmetic number, because the mean of its divisors is an integer number (221336708).

Almost surely, 2^664010121 is an apocalyptic number.

It is an amenable number.

664010121 is a deficient number, since it is larger than the sum of its proper divisors (221336711).

664010121 is a wasteful number, since it uses less digits than its factorization.

664010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221336710.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 664010121 is about 25768.3938381887. The cubic root of 664010121 is about 872.4185668505.

Adding to 664010121 its reverse (121010466), we get a palindrome (785020587).

It can be divided in two parts, 6640 and 10121, that added together give a palindrome (16761).

The spelling of 664010121 in words is "six hundred sixty-four million, ten thousand, one hundred twenty-one".