666164420 has 48 divisors (see below), whose sum is σ = 1445033520. Its totient is φ = 257826816.

The previous prime is 666164383. The next prime is 666164437. The reversal of 666164420 is 24461666.

It can be written as a sum of positive squares in 8 ways, for example, as 2483776 + 663680644 = 1576^2 + 25762^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73076 + ... + 81684.

It is an arithmetic number, because the mean of its divisors is an integer number (30104865).

Almost surely, 2^666164420 is an apocalyptic number.

It is an amenable number.

666164420 is an abundant number, since it is smaller than the sum of its proper divisors (778869100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666164420 is a wasteful number, since it uses less digits than its factorization.

666164420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8744 (or 8742 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 666164420 is about 25810.1611773348. The cubic root of 666164420 is about 873.3610331844.

The spelling of 666164420 in words is "six hundred sixty-six million, one hundred sixty-four thousand, four hundred twenty".