666698514 has 16 divisors (see below), whose sum is σ = 1333907328. Its totient is φ = 222147792.

The previous prime is 666698507. The next prime is 666698519. The reversal of 666698514 is 415896666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666698519) 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, 3082 + ... + 36645.

It is an arithmetic number, because the mean of its divisors is an integer number (83369208).

Almost surely, 2^666698514 is an apocalyptic number.

666698514 is an abundant number, since it is smaller than the sum of its proper divisors (667208814).

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

666698514 is a wasteful number, since it uses less digits than its factorization.

666698514 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42529.

The product of its digits is 1866240, while the sum is 51.

The square root of 666698514 is about 25820.5056883090. The cubic root of 666698514 is about 873.5943751189.

The spelling of 666698514 in words is "six hundred sixty-six million, six hundred ninety-eight thousand, five hundred fourteen".