131777866887 has 4 divisors (see below), whose sum is σ = 175703822520. Its totient is φ = 87851911256.

The previous prime is 131777866877. The next prime is 131777866889. The reversal of 131777866887 is 788668777131.

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 131777866887 - 2⁶ = 131777866823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131777866889) 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, 21962977812 + ... + 21962977817.

It is an arithmetic number, because the mean of its divisors is an integer number (43925955630).

Almost surely, 2^131777866887 is an apocalyptic number.

131777866887 is a deficient number, since it is larger than the sum of its proper divisors (43925955633).

131777866887 is an equidigital number, since it uses as much as digits as its factorization.

131777866887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43925955632.

The product of its digits is 132765696, while the sum is 69.

The spelling of 131777866887 in words is "one hundred thirty-one billion, seven hundred seventy-seven million, eight hundred sixty-six thousand, eight hundred eighty-seven".