666641602 has 16 divisors (see below), whose sum is σ = 1100880000. Its totient is φ = 300237840.

The previous prime is 666641567. The next prime is 666641603. The reversal of 666641602 is 206146666.

It is a super-2 number, since 2×666641602² = 888822051034252808, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666641603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136602 + ... + 141397.

It is an arithmetic number, because the mean of its divisors is an integer number (68805000).

Almost surely, 2^666641602 is an apocalyptic number.

666641602 is a deficient number, since it is larger than the sum of its proper divisors (434238398).

666641602 is a wasteful number, since it uses less digits than its factorization.

666641602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278121.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 666641602 is about 25819.4035949710. The cubic root of 666641602 is about 873.5695165975.

The spelling of 666641602 in words is "six hundred sixty-six million, six hundred forty-one thousand, six hundred two".