66751641 has 32 divisors (see below), whose sum is σ = 108374400. Its totient is φ = 40271040.

The previous prime is 66751627. The next prime is 66751651. The reversal of 66751641 is 14615766.

66751641 is a `hidden beast` number, since 6 + 6 + 7 + 5 + 1 + 641 = 666.

It is not a de Polignac number, because 66751641 - 2¹⁴ = 66735257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66751596 and 66751605.

It is not an unprimeable number, because it can be changed into a prime (66751651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93795 + ... + 94503.

It is an arithmetic number, because the mean of its divisors is an integer number (3386700).

Almost surely, 2^66751641 is an apocalyptic number.

It is an amenable number.

66751641 is a deficient number, since it is larger than the sum of its proper divisors (41622759).

66751641 is a wasteful number, since it uses less digits than its factorization.

66751641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046 (or 1040 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 66751641 is about 8170.1677461359. The cubic root of 66751641 is about 405.6523369143.

The spelling of 66751641 in words is "sixty-six million, seven hundred fifty-one thousand, six hundred forty-one".