66360402121 has 32 divisors (see below), whose sum is σ = 73698508800. Its totient is φ = 59374244160.

The previous prime is 66360402091. The next prime is 66360402137. The reversal of 66360402121 is 12120406366.

It is not a de Polignac number, because 66360402121 - 2¹⁵ = 66360369353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66360402151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51883960 + ... + 51885238.

It is an arithmetic number, because the mean of its divisors is an integer number (2303078400).

Almost surely, 2^66360402121 is an apocalyptic number.

It is an amenable number.

66360402121 is a deficient number, since it is larger than the sum of its proper divisors (7338106679).

66360402121 is a wasteful number, since it uses less digits than its factorization.

66360402121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 66360402121 its reverse (12120406366), we get a palindrome (78480808487).

The spelling of 66360402121 in words is "sixty-six billion, three hundred sixty million, four hundred two thousand, one hundred twenty-one".