66615051 has 16 divisors (see below), whose sum is σ = 89830400. Its totient is φ = 43908480.

The previous prime is 66615049. The next prime is 66615067. The reversal of 66615051 is 15051666.

It is not a de Polignac number, because 66615051 - 2¹ = 66615049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66615851) 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, 143646 + ... + 144108.

It is an arithmetic number, because the mean of its divisors is an integer number (5614400).

Almost surely, 2^66615051 is an apocalyptic number.

66615051 is a deficient number, since it is larger than the sum of its proper divisors (23215349).

66615051 is a wasteful number, since it uses less digits than its factorization.

66615051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66615051 is about 8161.8043960879. The cubic root of 66615051 is about 405.3754603829.

The spelling of 66615051 in words is "sixty-six million, six hundred fifteen thousand, fifty-one".