66802957 has 8 divisors (see below), whose sum is σ = 72928184. Its totient is φ = 60818688.

The previous prime is 66802943. The next prime is 66802961. The reversal of 66802957 is 75920866.

It can be written as a sum of positive squares in 4 ways, for example, as 6056521 + 60746436 = 2461^2 + 7794^2 .

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 66802957 - 2⁷ = 66802829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66802987) 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, 34248 + ... + 36145.

It is an arithmetic number, because the mean of its divisors is an integer number (9116023).

Almost surely, 2^66802957 is an apocalyptic number.

It is an amenable number.

66802957 is a deficient number, since it is larger than the sum of its proper divisors (6125227).

66802957 is a wasteful number, since it uses less digits than its factorization.

66802957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70479.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 66802957 is about 8173.3075924010. The cubic root of 66802957 is about 405.7562600689.

The spelling of 66802957 in words is "sixty-six million, eight hundred two thousand, nine hundred fifty-seven".