66772055 has 12 divisors (see below), whose sum is σ = 93208680. Its totient is φ = 45786384.

The previous prime is 66772051. The next prime is 66772093. The reversal of 66772055 is 55027766.

It is not a de Polignac number, because 66772055 - 2² = 66772051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66772051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136025 + ... + 136514.

It is an arithmetic number, because the mean of its divisors is an integer number (7767390).

Almost surely, 2^66772055 is an apocalyptic number.

66772055 is a deficient number, since it is larger than the sum of its proper divisors (26436625).

66772055 is a wasteful number, since it uses less digits than its factorization.

66772055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272558 (or 272551 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 66772055 is about 8171.4169517899. The cubic root of 66772055 is about 405.6936849254.

The spelling of 66772055 in words is "sixty-six million, seven hundred seventy-two thousand, fifty-five".