666261662030020 has 48 divisors (see below), whose sum is σ = 1599793440981120. Its totient is φ = 228323219537664.

The previous prime is 666261662029993. The next prime is 666261662030047. The reversal of 666261662030020 is 20030266162666.

It is an interprime number because it is at equal distance from previous prime (666261662029993) and next prime (666261662030047).

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, 1138772134 + ... + 1139357053.

It is an arithmetic number, because the mean of its divisors is an integer number (33329030020440).

Almost surely, 2^{666261662030020} is an apocalyptic number.

It is an amenable number.

666261662030020 is an abundant number, since it is smaller than the sum of its proper divisors (933531778951100).

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

666261662030020 is a wasteful number, since it uses less digits than its factorization.

666261662030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278131292 (or 2278131290 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 46.

The spelling of 666261662030020 in words is "six hundred sixty-six trillion, two hundred sixty-one billion, six hundred sixty-two million, thirty thousand, twenty".