664420101 has 16 divisors (see below), whose sum is σ = 935313600. Its totient is φ = 418376448.

The previous prime is 664420093. The next prime is 664420109. The reversal of 664420101 is 101024466.

It is an interprime number because it is at equal distance from previous prime (664420093) and next prime (664420109).

It is not a de Polignac number, because 664420101 - 2³ = 664420093 is a prime.

It is a super-2 number, since 2×664420101² = 882908141225700402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664420109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1915 + ... + 36503.

It is an arithmetic number, because the mean of its divisors is an integer number (58457100).

Almost surely, 2^664420101 is an apocalyptic number.

It is an amenable number.

664420101 is a deficient number, since it is larger than the sum of its proper divisors (270893499).

664420101 is a wasteful number, since it uses less digits than its factorization.

664420101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34948.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 664420101 is about 25776.3477048243. The cubic root of 664420101 is about 872.5980824758.

Adding to 664420101 its reverse (101024466), we get a palindrome (765444567).

The spelling of 664420101 in words is "six hundred sixty-four million, four hundred twenty thousand, one hundred one".