499987666 has 16 divisors (see below), whose sum is σ = 776563200. Its totient is φ = 241149328.

The previous prime is 499987643. The next prime is 499987669. The reversal of 499987666 is 666789994.

It is a junction number, because it is equal to n+sod(n) for n = 499987598 and 499987607.

It is not an unprimeable number, because it can be changed into a prime (499987669) 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, 71055 + ... + 77773.

It is an arithmetic number, because the mean of its divisors is an integer number (48535200).

Almost surely, 2^499987666 is an apocalyptic number.

499987666 is a deficient number, since it is larger than the sum of its proper divisors (276575534).

499987666 is a wasteful number, since it uses less digits than its factorization.

499987666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8033.

The product of its digits is 35271936, while the sum is 64.

The square root of 499987666 is about 22360.4039766727. The cubic root of 499987666 is about 793.6939995956.

It can be divided in two parts, 4999 and 87666, that added together give a triangular number (92665 = T₄₃₀).

The spelling of 499987666 in words is "four hundred ninety-nine million, nine hundred eighty-seven thousand, six hundred sixty-six".