117921877145855 has 8 divisors (see below), whose sum is σ = 141506330761152. Its totient is φ = 94337449592608.

The previous prime is 117921877145833. The next prime is 117921877145857. The reversal of 117921877145855 is 558541778129711.

It is a Cunningham number, because it is equal to 10859184²-1.

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

It is a cyclic number.

It is not a de Polignac number, because 117921877145855 - 2¹² = 117921877141759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117921877145857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5429594 + ... + 16288776.

It is an arithmetic number, because the mean of its divisors is an integer number (17688291345144).

Almost surely, 2^{117921877145855} is an apocalyptic number.

117921877145855 is a deficient number, since it is larger than the sum of its proper divisors (23584453615297).

117921877145855 is a wasteful number, since it uses less digits than its factorization.

117921877145855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031025.

The product of its digits is 197568000, while the sum is 71.

The spelling of 117921877145855 in words is "one hundred seventeen trillion, nine hundred twenty-one billion, eight hundred seventy-seven million, one hundred forty-five thousand, eight hundred fifty-five".