66846621064 has 8 divisors (see below), whose sum is σ = 125337414510. Its totient is φ = 33423310528.

The previous prime is 66846621041. The next prime is 66846621103. The reversal of 66846621064 is 46012664866.

It can be written as a sum of positive squares in only one way, i.e., 55644092100 + 11202528964 = 235890^2 + 105842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×66846621064³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66846620999 and 66846621017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4177913809 + ... + 4177913824.

Almost surely, 2^66846621064 is an apocalyptic number.

It is an amenable number.

66846621064 is a deficient number, since it is larger than the sum of its proper divisors (58490793446).

66846621064 is a wasteful number, since it uses less digits than its factorization.

66846621064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8355827639 (or 8355827635 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 49.

The spelling of 66846621064 in words is "sixty-six billion, eight hundred forty-six million, six hundred twenty-one thousand, sixty-four".