66699889000 has 48 divisors (see below), whose sum is σ = 156096853380. Its totient is φ = 26676688800.

The previous prime is 66699888973. The next prime is 66699889019. The reversal of 66699889000 is 98899666.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 45089124964 + 21610764036 = 212342^2 + 147006^2 .

It is a super-2 number, since 2×66699889000² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66699889000.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8162917 + ... + 8171083.

Almost surely, 2^66699889000 is an apocalyptic number.

It is an amenable number.

66699889000 is an abundant number, since it is smaller than the sum of its proper divisors (89396964380).

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

66699889000 is an frugal number, since it uses more digits than its factorization.

66699889000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16355 (or 8174 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 66699889000 in words is "sixty-six billion, six hundred ninety-nine million, eight hundred eighty-nine thousand".