66873905035551 has 40 divisors (see below), whose sum is σ = 100379116468224. Its totient is φ = 44368257312720.

The previous prime is 66873905035501. The next prime is 66873905035577. The reversal of 66873905035551 is 15553050937866.

66873905035551 is a `hidden beast` number, since 6 + 6 + 8 + 73 + 9 + 0 + 5 + 0 + 3 + 5 + 551 = 666.

It is not a de Polignac number, because 66873905035551 - 2¹³ = 66873905027359 is a prime.

It is a super-3 number, since 3×66873905035551³ (a number of 42 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66873905035501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19527430 + ... + 22695116.

Almost surely, 2^{66873905035551} is an apocalyptic number.

66873905035551 is a deficient number, since it is larger than the sum of its proper divisors (33505211432673).

66873905035551 is a wasteful number, since it uses less digits than its factorization.

66873905035551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168953 (or 3168944 counting only the distinct ones).

The product of its (nonzero) digits is 102060000, while the sum is 63.

The spelling of 66873905035551 in words is "sixty-six trillion, eight hundred seventy-three billion, nine hundred five million, thirty-five thousand, five hundred fifty-one".