66777737734 has 4 divisors (see below), whose sum is σ = 100166606604. Its totient is φ = 33388868866.

The previous prime is 66777737711. The next prime is 66777737743. The reversal of 66777737734 is 43773777766.

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

It is a super-3 number, since 3×66777737734³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16694434432 + ... + 16694434435.

It is an arithmetic number, because the mean of its divisors is an integer number (25041651651).

Almost surely, 2^66777737734 is an apocalyptic number.

66777737734 is a deficient number, since it is larger than the sum of its proper divisors (33388868870).

66777737734 is a wasteful number, since it uses less digits than its factorization.

66777737734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33388868869.

The product of its digits is 152473104, while the sum is 64.

The spelling of 66777737734 in words is "sixty-six billion, seven hundred seventy-seven million, seven hundred thirty-seven thousand, seven hundred thirty-four".