66651039777 has 8 divisors (see below), whose sum is σ = 101563489216. Its totient is φ = 38086308432.

The previous prime is 66651039773. The next prime is 66651039803. The reversal of 66651039777 is 77793015666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66651039777 - 2² = 66651039773 is a prime.

It is a super-2 number, since 2×66651039777² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66651039773) 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, 1586929498 + ... + 1586929539.

It is an arithmetic number, because the mean of its divisors is an integer number (12695436152).

Almost surely, 2^66651039777 is an apocalyptic number.

It is an amenable number.

66651039777 is a deficient number, since it is larger than the sum of its proper divisors (34912449439).

66651039777 is a wasteful number, since it uses less digits than its factorization.

66651039777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173859047.

The product of its (nonzero) digits is 10001880, while the sum is 57.

The spelling of 66651039777 in words is "sixty-six billion, six hundred fifty-one million, thirty-nine thousand, seven hundred seventy-seven".