66700400673999 has 16 divisors (see below), whose sum is σ = 90463104950400. Its totient is φ = 43702679818656.

The previous prime is 66700400673943. The next prime is 66700400674031. The reversal of 66700400673999 is 99937600400766.

It is not a de Polignac number, because 66700400673999 - 2⁴⁰ = 65600889046223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700400623999) 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, 44857429 + ... + 46320510.

It is an arithmetic number, because the mean of its divisors is an integer number (5653944059400).

Almost surely, 2^{66700400673999} is an apocalyptic number.

66700400673999 is a deficient number, since it is larger than the sum of its proper divisors (23762704276401).

66700400673999 is a wasteful number, since it uses less digits than its factorization.

66700400673999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91182134.

The product of its (nonzero) digits is 92588832, while the sum is 66.

The spelling of 66700400673999 in words is "sixty-six trillion, seven hundred billion, four hundred million, six hundred seventy-three thousand, nine hundred ninety-nine".