66744351 has 16 divisors (see below), whose sum is σ = 101293920. Its totient is φ = 43410240.

The previous prime is 66744343. The next prime is 66744361. The reversal of 66744351 is 15344766.

It is a happy number.

It is not a de Polignac number, because 66744351 - 2³ = 66744343 is a prime.

It is a super-2 number, since 2×66744351² = 8909616780822402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66744361) 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, 29040 + ... + 31253.

It is an arithmetic number, because the mean of its divisors is an integer number (6330870).

Almost surely, 2^66744351 is an apocalyptic number.

66744351 is a deficient number, since it is larger than the sum of its proper divisors (34549569).

66744351 is a wasteful number, since it uses less digits than its factorization.

66744351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60343 (or 60337 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 66744351 is about 8169.7215986838. The cubic root of 66744351 is about 405.6375691715.

It can be divided in two parts, 6674 and 4351, that added together give a square (11025 = 105²).

The spelling of 66744351 in words is "sixty-six million, seven hundred forty-four thousand, three hundred fifty-one".