66729955 has 4 divisors (see below), whose sum is σ = 80075952. Its totient is φ = 53383960.

The previous prime is 66729953. The next prime is 66729973. The reversal of 66729955 is 55992766.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66729955 - 2¹ = 66729953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66729899 and 66729908.

It is not an unprimeable number, because it can be changed into a prime (66729953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6672991 + ... + 6673000.

It is an arithmetic number, because the mean of its divisors is an integer number (20018988).

Almost surely, 2^66729955 is an apocalyptic number.

66729955 is a deficient number, since it is larger than the sum of its proper divisors (13345997).

66729955 is a wasteful number, since it uses less digits than its factorization.

66729955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345996.

The product of its digits is 1020600, while the sum is 49.

The square root of 66729955 is about 8168.8404929953. The cubic root of 66729955 is about 405.6084032658.

The spelling of 66729955 in words is "sixty-six million, seven hundred twenty-nine thousand, nine hundred fifty-five".