66020251 has 8 divisors (see below), whose sum is σ = 73009584. Its totient is φ = 59195520.

The previous prime is 66020243. The next prime is 66020287. The reversal of 66020251 is 15202066.

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 66020251 - 2³ = 66020243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66020551) 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, 40306 + ... + 41911.

It is an arithmetic number, because the mean of its divisors is an integer number (9126198).

Almost surely, 2^66020251 is an apocalyptic number.

66020251 is a deficient number, since it is larger than the sum of its proper divisors (6989333).

66020251 is a wasteful number, since it uses less digits than its factorization.

66020251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82301.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 66020251 is about 8125.2846719361. The cubic root of 66020251 is about 404.1653307404.

The spelling of 66020251 in words is "sixty-six million, twenty thousand, two hundred fifty-one".