66918741 has 16 divisors (see below), whose sum is σ = 95923200. Its totient is φ = 41363568.

The previous prime is 66918727. The next prime is 66918757. The reversal of 66918741 is 14781966.

It is a de Polignac number, because none of the positive numbers 2^k-66918741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66918693 and 66918702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66918721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9811 + ... + 15168.

It is an arithmetic number, because the mean of its divisors is an integer number (5995200).

Almost surely, 2^66918741 is an apocalyptic number.

It is an amenable number.

66918741 is a deficient number, since it is larger than the sum of its proper divisors (29004459).

66918741 is a wasteful number, since it uses less digits than its factorization.

66918741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25048.

The product of its digits is 72576, while the sum is 42.

The square root of 66918741 is about 8180.3875825049. The cubic root of 66918741 is about 405.9905459389.

The spelling of 66918741 in words is "sixty-six million, nine hundred eighteen thousand, seven hundred forty-one".