11673977781 has 8 divisors (see below), whose sum is σ = 15985987744. Its totient is φ = 7572309840.

The previous prime is 11673977779. The next prime is 11673977807. The reversal of 11673977781 is 18777937611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11673977781 - 2¹ = 11673977779 is a prime.

It is a super-2 number, since 2×11673977781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11673977771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52585375 + ... + 52585596.

It is an arithmetic number, because the mean of its divisors is an integer number (1998248468).

Almost surely, 2^11673977781 is an apocalyptic number.

It is an amenable number.

11673977781 is a deficient number, since it is larger than the sum of its proper divisors (4312009963).

11673977781 is a wasteful number, since it uses less digits than its factorization.

11673977781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105171011.

The product of its digits is 3111696, while the sum is 57.

The spelling of 11673977781 in words is "eleven billion, six hundred seventy-three million, nine hundred seventy-seven thousand, seven hundred eighty-one".