666260526533351 has 4 divisors (see below), whose sum is σ = 666264354229104. Its totient is φ = 666256698837600.

The previous prime is 666260526533263. The next prime is 666260526533363. The reversal of 666260526533351 is 153335625062666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666260526533351 - 2³⁴ = 666243346664167 is a prime.

It is a super-2 number, since 2×666260526533351² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666260526539351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1913586770 + ... + 1913934911.

It is an arithmetic number, because the mean of its divisors is an integer number (166566088557276).

Almost surely, 2^{666260526533351} is an apocalyptic number.

666260526533351 is a deficient number, since it is larger than the sum of its proper divisors (3827695753).

666260526533351 is a wasteful number, since it uses less digits than its factorization.

666260526533351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3827695752.

The product of its (nonzero) digits is 104976000, while the sum is 59.

The spelling of 666260526533351 in words is "six hundred sixty-six trillion, two hundred sixty billion, five hundred twenty-six million, five hundred thirty-three thousand, three hundred fifty-one".