66051261 has 16 divisors (see below), whose sum is σ = 98956800. Its totient is φ = 43537824.

The previous prime is 66051257. The next prime is 66051263. The reversal of 66051261 is 16215066.

It is a happy number.

It is not a de Polignac number, because 66051261 - 2² = 66051257 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66051263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11341 + ... + 16146.

It is an arithmetic number, because the mean of its divisors is an integer number (6184800).

Almost surely, 2^66051261 is an apocalyptic number.

It is an amenable number.

66051261 is a deficient number, since it is larger than the sum of its proper divisors (32905539).

66051261 is a wasteful number, since it uses less digits than its factorization.

66051261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27585 (or 27579 counting only the distinct ones).

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

The square root of 66051261 is about 8127.1926887456. The cubic root of 66051261 is about 404.2286002420.

The spelling of 66051261 in words is "sixty-six million, fifty-one thousand, two hundred sixty-one".