66666051 has 16 divisors (see below), whose sum is σ = 99088800. Its totient is φ = 44298144.

The previous prime is 66666049. The next prime is 66666053. The reversal of 66666051 is 15066666.

It is an interprime number because it is at equal distance from previous prime (66666049) and next prime (66666053).

It is not a de Polignac number, because 66666051 - 2¹ = 66666049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66665997 and 66666015.

It is not an unprimeable number, because it can be changed into a prime (66666053) 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, 4665 + ... + 12453.

It is an arithmetic number, because the mean of its divisors is an integer number (6193050).

Almost surely, 2^66666051 is an apocalyptic number.

66666051 is a deficient number, since it is larger than the sum of its proper divisors (32422749).

66666051 is a wasteful number, since it uses less digits than its factorization.

66666051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115 (or 8109 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 66666051 is about 8164.9281074606. The cubic root of 66666051 is about 405.4788848314.

The spelling of 66666051 in words is "sixty-six million, six hundred sixty-six thousand, fifty-one".