66924778747 has 8 divisors (see below), whose sum is σ = 73942466976. Its totient is φ = 60249416832.

The previous prime is 66924778721. The next prime is 66924778751. The reversal of 66924778747 is 74787742966.

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

It is a cyclic number.

It is not a de Polignac number, because 66924778747 - 2⁷ = 66924778619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66924778847) 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, 85581168 + ... + 85581949.

It is an arithmetic number, because the mean of its divisors is an integer number (9242808372).

Almost surely, 2^66924778747 is an apocalyptic number.

66924778747 is a deficient number, since it is larger than the sum of its proper divisors (7017688229).

66924778747 is a wasteful number, since it uses less digits than its factorization.

66924778747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171163157.

The product of its digits is 199148544, while the sum is 67.

The spelling of 66924778747 in words is "sixty-six billion, nine hundred twenty-four million, seven hundred seventy-eight thousand, seven hundred forty-seven".