165454728977 has 2 divisors, whose sum is σ = 165454728978. Its totient is φ = 165454728976.

The previous prime is 165454728931. The next prime is 165454728979. The reversal of 165454728977 is 779827454561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154198367761 + 11256361216 = 392681^2 + 106096^2 .

It is a cyclic number.

It is not a de Polignac number, because 165454728977 - 2¹² = 165454724881 is a prime.

Together with 165454728979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165454728979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82727364488 + 82727364489.

It is an arithmetic number, because the mean of its divisors is an integer number (82727364489).

Almost surely, 2^165454728977 is an apocalyptic number.

It is an amenable number.

165454728977 is a deficient number, since it is larger than the sum of its proper divisors (1).

165454728977 is an equidigital number, since it uses as much as digits as its factorization.

165454728977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118540800, while the sum is 65.

The spelling of 165454728977 in words is "one hundred sixty-five billion, four hundred fifty-four million, seven hundred twenty-eight thousand, nine hundred seventy-seven".