66120723 has 12 divisors (see below), whose sum is σ = 95598048. Its totient is φ = 44038800.

The previous prime is 66120697. The next prime is 66120727. The reversal of 66120723 is 32702166.

It is a happy number.

It is not a de Polignac number, because 66120723 - 2¹³ = 66112531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66120727) 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, 8886 + ... + 14532.

It is an arithmetic number, because the mean of its divisors is an integer number (7966504).

Almost surely, 2^66120723 is an apocalyptic number.

66120723 is a deficient number, since it is larger than the sum of its proper divisors (29477325).

66120723 is a wasteful number, since it uses less digits than its factorization.

66120723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6954 (or 6951 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 66120723 is about 8131.4649971576. The cubic root of 66120723 is about 404.3702512846.

Adding to 66120723 its reverse (32702166), we get a palindrome (98822889).

The spelling of 66120723 in words is "sixty-six million, one hundred twenty thousand, seven hundred twenty-three".