66061251 has 14 divisors (see below), whose sum is σ = 99047660. Its totient is φ = 44040348.

The previous prime is 66061223. The next prime is 66061253. The reversal of 66061251 is 15216066.

It is a happy number.

66061251 is a `hidden beast` number, since 6 + 606 + 1 + 2 + 51 = 666.

It is not a de Polignac number, because 66061251 - 2⁶ = 66061187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66061253) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 44581 + ... + 46038.

Almost surely, 2^66061251 is an apocalyptic number.

66061251 is a deficient number, since it is larger than the sum of its proper divisors (32986409).

66061251 is an frugal number, since it uses more digits than its factorization.

66061251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90637 (or 90622 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66061251 is about 8127.8072688764. The cubic root of 66061251 is about 404.2489785566.

The spelling of 66061251 in words is "sixty-six million, sixty-one thousand, two hundred fifty-one".