668687702 has 4 divisors (see below), whose sum is σ = 1003031556. Its totient is φ = 334343850.

The previous prime is 668687699. The next prime is 668687759. The reversal of 668687702 is 207786866.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167171924 + ... + 167171927.

It is an arithmetic number, because the mean of its divisors is an integer number (250757889).

Almost surely, 2^668687702 is an apocalyptic number.

668687702 is a deficient number, since it is larger than the sum of its proper divisors (334343854).

668687702 is a wasteful number, since it uses less digits than its factorization.

668687702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334343853.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The square root of 668687702 is about 25858.9965389224. The cubic root of 668687702 is about 874.4623426754.

The spelling of 668687702 in words is "six hundred sixty-eight million, six hundred eighty-seven thousand, seven hundred two".