187317545918977 has 2 divisors, whose sum is σ = 187317545918978. Its totient is φ = 187317545918976.

The previous prime is 187317545918933. The next prime is 187317545918989. The reversal of 187317545918977 is 779819545713781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182943776000241 + 4373769918736 = 13525671^2 + 2091356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187317545918977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187317545918977.

It is not a weakly prime, because it can be changed into another prime (187317545918927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93658772959488 + 93658772959489.

It is an arithmetic number, because the mean of its divisors is an integer number (93658772959489).

Almost surely, 2^{187317545918977} is an apocalyptic number.

It is an amenable number.

187317545918977 is a deficient number, since it is larger than the sum of its proper divisors (1).

187317545918977 is an equidigital number, since it uses as much as digits as its factorization.

187317545918977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3734035200, while the sum is 82.

It can be divided in two parts, 18731754 and 5918977, that added together give a triangular number (24650731 = T₇₀₂₁).

The spelling of 187317545918977 in words is "one hundred eighty-seven trillion, three hundred seventeen billion, five hundred forty-five million, nine hundred eighteen thousand, nine hundred seventy-seven".