66614739 has 16 divisors (see below), whose sum is σ = 93111552. Its totient is φ = 42281888.

The previous prime is 66614731. The next prime is 66614749. The reversal of 66614739 is 93741666.

It is a cyclic number.

It is not a de Polignac number, because 66614739 - 2³ = 66614731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66614739.

It is not an unprimeable number, because it can be changed into a prime (66614731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13537 + ... + 17789.

It is an arithmetic number, because the mean of its divisors is an integer number (5819472).

Almost surely, 2^66614739 is an apocalyptic number.

66614739 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

66614739 is a deficient number, since it is larger than the sum of its proper divisors (26496813).

66614739 is a wasteful number, since it uses less digits than its factorization.

66614739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506.

The product of its digits is 163296, while the sum is 42.

The square root of 66614739 is about 8161.7852826450. The cubic root of 66614739 is about 405.3748275062.

The spelling of 66614739 in words is "sixty-six million, six hundred fourteen thousand, seven hundred thirty-nine".