64666422667 has 8 divisors (see below), whose sum is σ = 80623072512. Its totient is φ = 50389420200.

The previous prime is 64666422631. The next prime is 64666422679. The reversal of 64666422667 is 76622466646.

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

It is not a de Polignac number, because 64666422667 - 2³⁵ = 30306684299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64666422607) 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, 419911759 + ... + 419911912.

It is an arithmetic number, because the mean of its divisors is an integer number (10077884064).

Almost surely, 2^64666422667 is an apocalyptic number.

64666422667 is a deficient number, since it is larger than the sum of its proper divisors (15956649845).

64666422667 is a wasteful number, since it uses less digits than its factorization.

64666422667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839823689.

The product of its digits is 20901888, while the sum is 55.

The spelling of 64666422667 in words is "sixty-four billion, six hundred sixty-six million, four hundred twenty-two thousand, six hundred sixty-seven".