66516429 has 16 divisors (see below), whose sum is σ = 102136320. Its totient is φ = 37717680.

The previous prime is 66516419. The next prime is 66516469. The reversal of 66516429 is 92461566.

It is not a de Polignac number, because 66516429 - 2¹⁵ = 66483661 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66516409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9339 + ... + 14840.

It is an arithmetic number, because the mean of its divisors is an integer number (6383520).

Almost surely, 2^66516429 is an apocalyptic number.

It is an amenable number.

66516429 is a deficient number, since it is larger than the sum of its proper divisors (35619891).

66516429 is a wasteful number, since it uses less digits than its factorization.

66516429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24320.

The product of its digits is 77760, while the sum is 39.

The square root of 66516429 is about 8155.7604795629. The cubic root of 66516429 is about 405.1753120001.

The spelling of 66516429 in words is "sixty-six million, five hundred sixteen thousand, four hundred twenty-nine".