666534136620155 has 16 divisors (see below), whose sum is σ = 810816051698400. Its totient is φ = 525910914978048.

The previous prime is 666534136620151. The next prime is 666534136620161. The reversal of 666534136620155 is 551026631435666.

It is a cyclic number.

It is not a de Polignac number, because 666534136620155 - 2² = 666534136620151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666534136620094 and 666534136620103.

It is not an unprimeable number, because it can be changed into a prime (666534136620151) 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, 4521980 + ... + 36790169.

It is an arithmetic number, because the mean of its divisors is an integer number (50676003231150).

Almost surely, 2^{666534136620155} is an apocalyptic number.

666534136620155 is a deficient number, since it is larger than the sum of its proper divisors (144281915078245).

666534136620155 is a wasteful number, since it uses less digits than its factorization.

666534136620155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41356430.

The product of its (nonzero) digits is 69984000, while the sum is 59.

The spelling of 666534136620155 in words is "six hundred sixty-six trillion, five hundred thirty-four billion, one hundred thirty-six million, six hundred twenty thousand, one hundred fifty-five".