66121233635451 has 16 divisors (see below), whose sum is σ = 89404779594240. Its totient is φ = 43459274792640.

The previous prime is 66121233635411. The next prime is 66121233635467. The reversal of 66121233635451 is 15453633212166.

It is not a de Polignac number, because 66121233635451 - 2¹⁰ = 66121233634427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66121233635451.

It is not an unprimeable number, because it can be changed into a prime (66121233635411) 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, 11136231 + ... + 16008063.

It is an arithmetic number, because the mean of its divisors is an integer number (5587798724640).

Almost surely, 2^{66121233635451} is an apocalyptic number.

66121233635451 is a deficient number, since it is larger than the sum of its proper divisors (23283545958789).

66121233635451 is a wasteful number, since it uses less digits than its factorization.

66121233635451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4935626.

The product of its digits is 2332800, while the sum is 48.

The spelling of 66121233635451 in words is "sixty-six trillion, one hundred twenty-one billion, two hundred thirty-three million, six hundred thirty-five thousand, four hundred fifty-one".