66722055 has 16 divisors (see below), whose sum is σ = 107204064. Its totient is φ = 35435520.

The previous prime is 66722041. The next prime is 66722077. The reversal of 66722055 is 55022766.

66722055 = 3651² + 3652² + ... + 3655².

It is not a de Polignac number, because 66722055 - 2⁴ = 66722039 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5614 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (6700254).

Almost surely, 2^66722055 is an apocalyptic number.

66722055 is a deficient number, since it is larger than the sum of its proper divisors (40482009).

66722055 is a wasteful number, since it uses less digits than its factorization.

66722055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18706.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 66722055 is about 8168.3569339250. The cubic root of 66722055 is about 405.5923962974.

It can be divided in two parts, 667 and 22055, that added together give a palindrome (22722).

The spelling of 66722055 in words is "sixty-six million, seven hundred twenty-two thousand, fifty-five".