181377620667 has 6 divisors (see below), whose sum is σ = 261989896532. Its totient is φ = 120918413772.

The previous prime is 181377620603. The next prime is 181377620701. The reversal of 181377620667 is 766026773181.

181377620667 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 7 + 7 + 620 + 6 + 6 + 7 = 666.

It is not a de Polignac number, because 181377620667 - 2⁶ = 181377620603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181377622667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10076534473 + ... + 10076534490.

Almost surely, 2^181377620667 is an apocalyptic number.

181377620667 is a deficient number, since it is larger than the sum of its proper divisors (80612275865).

181377620667 is a wasteful number, since it uses less digits than its factorization.

181377620667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20153068969 (or 20153068966 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 54.

The spelling of 181377620667 in words is "one hundred eighty-one billion, three hundred seventy-seven million, six hundred twenty thousand, six hundred sixty-seven".