117781201887 has 4 divisors (see below), whose sum is σ = 157041602520. Its totient is φ = 78520801256.

The previous prime is 117781201871. The next prime is 117781201907. The reversal of 117781201887 is 788102187711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 117781201887 - 2⁴ = 117781201871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117781201787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19630200312 + ... + 19630200317.

It is an arithmetic number, because the mean of its divisors is an integer number (39260400630).

Almost surely, 2^117781201887 is an apocalyptic number.

117781201887 is a deficient number, since it is larger than the sum of its proper divisors (39260400633).

117781201887 is an equidigital number, since it uses as much as digits as its factorization.

117781201887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39260400632.

The product of its (nonzero) digits is 351232, while the sum is 51.

The spelling of 117781201887 in words is "one hundred seventeen billion, seven hundred eighty-one million, two hundred one thousand, eight hundred eighty-seven".