66955429 has 4 divisors (see below), whose sum is σ = 68512576. Its totient is φ = 65398284.

The previous prime is 66955417. The next prime is 66955451. The reversal of 66955429 is 92455966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92455966 = 2 ⋅46227983.

It is a cyclic number.

It is not a de Polignac number, because 66955429 - 2¹⁷ = 66824357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66955489) 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, 778509 + ... + 778594.

It is an arithmetic number, because the mean of its divisors is an integer number (17128144).

Almost surely, 2^66955429 is an apocalyptic number.

It is an amenable number.

66955429 is a deficient number, since it is larger than the sum of its proper divisors (1557147).

66955429 is a wasteful number, since it uses less digits than its factorization.

66955429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557146.

The product of its digits is 583200, while the sum is 46.

The square root of 66955429 is about 8182.6297117736. The cubic root of 66955429 is about 406.0647267524.

The spelling of 66955429 in words is "sixty-six million, nine hundred fifty-five thousand, four hundred twenty-nine".