66505351 has 18 divisors (see below), whose sum is σ = 76490960. Its totient is φ = 57775080.

The previous prime is 66505337. The next prime is 66505363. The reversal of 66505351 is 15350566.

It is not a de Polignac number, because 66505351 - 2⁵ = 66505319 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 (66505051) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63490 + ... + 64528.

Almost surely, 2^66505351 is an apocalyptic number.

66505351 is a deficient number, since it is larger than the sum of its proper divisors (9985609).

66505351 is a wasteful number, since it uses less digits than its factorization.

66505351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 66505351 is about 8155.0812994108. The cubic root of 66505351 is about 405.1528174005.

The spelling of 66505351 in words is "sixty-six million, five hundred five thousand, three hundred fifty-one".