66402051 has 16 divisors (see below), whose sum is σ = 94352544. Its totient is φ = 41393664.

The previous prime is 66402043. The next prime is 66402053. The reversal of 66402051 is 15020466.

It is not a de Polignac number, because 66402051 - 2³ = 66402043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66402053) 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, 3861 + ... + 12153.

It is an arithmetic number, because the mean of its divisors is an integer number (5897034).

Almost surely, 2^66402051 is an apocalyptic number.

66402051 is a deficient number, since it is larger than the sum of its proper divisors (27950493).

66402051 is a wasteful number, since it uses less digits than its factorization.

66402051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8470.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66402051 is about 8148.7453635514. The cubic root of 66402051 is about 404.9429396826.

The spelling of 66402051 in words is "sixty-six million, four hundred two thousand, fifty-one".