11721236164678 has 16 divisors (see below), whose sum is σ = 18507308361840. Its totient is φ = 5552136489600.

The previous prime is 11721236164549. The next prime is 11721236164717. The reversal of 11721236164678 is 87646163212711.

It is a super-2 number, since 2×11721236164678² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8198658 + ... + 9521578.

It is an arithmetic number, because the mean of its divisors is an integer number (1156706772615).

Almost surely, 2^{11721236164678} is an apocalyptic number.

11721236164678 is a deficient number, since it is larger than the sum of its proper divisors (6786072197162).

11721236164678 is a wasteful number, since it uses less digits than its factorization.

11721236164678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556103.

The product of its digits is 4064256, while the sum is 55.

The spelling of 11721236164678 in words is "eleven trillion, seven hundred twenty-one billion, two hundred thirty-six million, one hundred sixty-four thousand, six hundred seventy-eight".