686620966 has 16 divisors (see below), whose sum is σ = 1037443680. Its totient is φ = 340813440.

The previous prime is 686620933. The next prime is 686620967. The reversal of 686620966 is 669026686.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686620967) 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, 261870 + ... + 264478.

It is an arithmetic number, because the mean of its divisors is an integer number (64840230).

Almost surely, 2^686620966 is an apocalyptic number.

686620966 is a deficient number, since it is larger than the sum of its proper divisors (350822714).

686620966 is a wasteful number, since it uses less digits than its factorization.

686620966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The square root of 686620966 is about 26203.4533220337. The cubic root of 686620966 is about 882.2107662826.

The spelling of 686620966 in words is "six hundred eighty-six million, six hundred twenty thousand, nine hundred sixty-six".