66722553 has 12 divisors (see below), whose sum is σ = 97816368. Its totient is φ = 43817400.

The previous prime is 66722527. The next prime is 66722567. The reversal of 66722553 is 35522766.

It is a happy number.

It is not a de Polignac number, because 66722553 - 2⁹ = 66722041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66722153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54723 + ... + 55928.

It is an arithmetic number, because the mean of its divisors is an integer number (8151364).

Almost surely, 2^66722553 is an apocalyptic number.

It is an amenable number.

66722553 is a deficient number, since it is larger than the sum of its proper divisors (31093815).

66722553 is a wasteful number, since it uses less digits than its factorization.

66722553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110724 (or 110721 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 66722553 is about 8168.3874173548. The cubic root of 66722553 is about 405.5934053816.

It can be divided in two parts, 667 and 22553, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 66722553 in words is "sixty-six million, seven hundred twenty-two thousand, five hundred fifty-three".