66874378842415 has 32 divisors (see below), whose sum is σ = 81404177670144. Its totient is φ = 52735068247680.

The previous prime is 66874378842389. The next prime is 66874378842433. The reversal of 66874378842415 is 51424887347866.

It is not a de Polignac number, because 66874378842415 - 2⁷ = 66874378842287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1286737380 + ... + 1286789350.

It is an arithmetic number, because the mean of its divisors is an integer number (2543880552192).

Almost surely, 2^{66874378842415} is an apocalyptic number.

66874378842415 is a deficient number, since it is larger than the sum of its proper divisors (14529798827729).

66874378842415 is a wasteful number, since it uses less digits than its factorization.

66874378842415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65167.

The product of its digits is 1734082560, while the sum is 73.

The spelling of 66874378842415 in words is "sixty-six trillion, eight hundred seventy-four billion, three hundred seventy-eight million, eight hundred forty-two thousand, four hundred fifteen".