66894708610 has 32 divisors (see below), whose sum is σ = 124617754800. Its totient is φ = 25823750400.

The previous prime is 66894708599. The next prime is 66894708613. The reversal of 66894708610 is 1680749866.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 58997009449 + 7897699161 = 242893^2 + 88869^2 .

It is not an unprimeable number, because it can be changed into a prime (66894708613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 619660 + ... + 719560.

Almost surely, 2^66894708610 is an apocalyptic number.

66894708610 is a deficient number, since it is larger than the sum of its proper divisors (57723046190).

66894708610 is a wasteful number, since it uses less digits than its factorization.

66894708610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102246.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 66894708610 in words is "sixty-six billion, eight hundred ninety-four million, seven hundred eight thousand, six hundred ten".