66051816674 has 4 divisors (see below), whose sum is σ = 99077725014. Its totient is φ = 33025908336.

The previous prime is 66051816661. The next prime is 66051816689. The reversal of 66051816674 is 47661815066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 46770550225 + 19281266449 = 216265^2 + 138857^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16512954167 + ... + 16512954170.

Almost surely, 2^66051816674 is an apocalyptic number.

66051816674 is a deficient number, since it is larger than the sum of its proper divisors (33025908340).

66051816674 is a wasteful number, since it uses less digits than its factorization.

66051816674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33025908339.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 66051816674 in words is "sixty-six billion, fifty-one million, eight hundred sixteen thousand, six hundred seventy-four".