66761533 has 8 divisors (see below), whose sum is σ = 70773048. Its totient is φ = 62759424.

The previous prime is 66761531. The next prime is 66761537. The reversal of 66761533 is 33516766.

It can be written as a sum of positive squares in 4 ways, for example, as 32970564 + 33790969 = 5742^2 + 5813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66761533 - 2¹ = 66761531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66761492 and 66761501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16785 + ... + 20377.

It is an arithmetic number, because the mean of its divisors is an integer number (8846631).

Almost surely, 2^66761533 is an apocalyptic number.

It is an amenable number.

66761533 is a deficient number, since it is larger than the sum of its proper divisors (4011515).

66761533 is a wasteful number, since it uses less digits than its factorization.

66761533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4703.

The product of its digits is 68040, while the sum is 37.

The square root of 66761533 is about 8170.7730968373. The cubic root of 66761533 is about 405.6723739484.

The spelling of 66761533 in words is "sixty-six million, seven hundred sixty-one thousand, five hundred thirty-three".