66115723 has 2 divisors, whose sum is σ = 66115724. Its totient is φ = 66115722.

The previous prime is 66115681. The next prime is 66115733. The reversal of 66115723 is 32751166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66115723 - 2²¹ = 64018571 is a prime.

It is not a weakly prime, because it can be changed into another prime (66115733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33057861 + 33057862.

It is an arithmetic number, because the mean of its divisors is an integer number (33057862).

Almost surely, 2^66115723 is an apocalyptic number.

66115723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66115723 is an equidigital number, since it uses as much as digits as its factorization.

66115723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 31.

The square root of 66115723 is about 8131.1575436711. The cubic root of 66115723 is about 404.3600583016.

Adding to 66115723 its reverse (32751166), we get a palindrome (98866889).

It can be divided in two parts, 661 and 15723, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 66115723 in words is "sixty-six million, one hundred fifteen thousand, seven hundred twenty-three".