185143136977 has 2 divisors, whose sum is σ = 185143136978. Its totient is φ = 185143136976.

The previous prime is 185143136957. The next prime is 185143136999. The reversal of 185143136977 is 779631341581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131798767681 + 53344369296 = 363041^2 + 230964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185143136977 is a prime.

It is not a weakly prime, because it can be changed into another prime (185143136957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92571568488 + 92571568489.

It is an arithmetic number, because the mean of its divisors is an integer number (92571568489).

Almost surely, 2^185143136977 is an apocalyptic number.

It is an amenable number.

185143136977 is a deficient number, since it is larger than the sum of its proper divisors (1).

185143136977 is an equidigital number, since it uses as much as digits as its factorization.

185143136977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3810240, while the sum is 55.

The spelling of 185143136977 in words is "one hundred eighty-five billion, one hundred forty-three million, one hundred thirty-six thousand, nine hundred seventy-seven".