666202121553 has 8 divisors (see below), whose sum is σ = 909934605216. Its totient is φ = 433302192800.

The previous prime is 666202121531. The next prime is 666202121569. The reversal of 666202121553 is 355121202666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666202121553 - 2⁶ = 666202121489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666202121153) 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, 2708138583 + ... + 2708138828.

It is an arithmetic number, because the mean of its divisors is an integer number (113741825652).

Almost surely, 2^666202121553 is an apocalyptic number.

It is an amenable number.

666202121553 is a deficient number, since it is larger than the sum of its proper divisors (243732483663).

666202121553 is a wasteful number, since it uses less digits than its factorization.

666202121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5416277455.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 666202121553 in words is "six hundred sixty-six billion, two hundred two million, one hundred twenty-one thousand, five hundred fifty-three".