66701556610 has 16 divisors (see below), whose sum is σ = 129298402296. Its totient is φ = 24628267008.

The previous prime is 66701556583. The next prime is 66701556611. The reversal of 66701556610 is 1665510766.

It can be written as a sum of positive squares in 4 ways, for example, as 18923028721 + 47778527889 = 137561^2 + 218583^2 .

It is not an unprimeable number, because it can be changed into a prime (66701556611) 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, 256544319 + ... + 256544578.

Almost surely, 2^66701556610 is an apocalyptic number.

66701556610 is a deficient number, since it is larger than the sum of its proper divisors (62596845686).

66701556610 is a wasteful number, since it uses less digits than its factorization.

66701556610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513088917.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 66701556610 in words is "sixty-six billion, seven hundred one million, five hundred fifty-six thousand, six hundred ten".