171842772977 has 2 divisors, whose sum is σ = 171842772978. Its totient is φ = 171842772976.

The previous prime is 171842772973. The next prime is 171842772991. The reversal of 171842772977 is 779277248171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102022109281 + 69820663696 = 319409^2 + 264236^2 .

It is a cyclic number.

It is not a de Polignac number, because 171842772977 - 2² = 171842772973 is a prime.

It is a super-2 number, since 2×171842772977² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171842772973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85921386488 + 85921386489.

It is an arithmetic number, because the mean of its divisors is an integer number (85921386489).

Almost surely, 2^171842772977 is an apocalyptic number.

It is an amenable number.

171842772977 is a deficient number, since it is larger than the sum of its proper divisors (1).

171842772977 is an equidigital number, since it uses as much as digits as its factorization.

171842772977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19361664, while the sum is 62.

The spelling of 171842772977 in words is "one hundred seventy-one billion, eight hundred forty-two million, seven hundred seventy-two thousand, nine hundred seventy-seven".