666516535 has 16 divisors (see below), whose sum is σ = 847988352. Its totient is φ = 501184000.

The previous prime is 666516533. The next prime is 666516553. The reversal of 666516535 is 535615666.

It is not a de Polignac number, because 666516535 - 2¹ = 666516533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666516491 and 666516500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666516533) 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, 65010 + ... + 74560.

It is an arithmetic number, because the mean of its divisors is an integer number (52999272).

Almost surely, 2^666516535 is an apocalyptic number.

666516535 is a deficient number, since it is larger than the sum of its proper divisors (181471817).

666516535 is a wasteful number, since it uses less digits than its factorization.

666516535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10394.

The product of its digits is 486000, while the sum is 43.

The square root of 666516535 is about 25816.9815237955. The cubic root of 666516535 is about 873.5148837676.

The spelling of 666516535 in words is "six hundred sixty-six million, five hundred sixteen thousand, five hundred thirty-five".