642136177 has 2 divisors, whose sum is σ = 642136178. Its totient is φ = 642136176.

The previous prime is 642136169. The next prime is 642136199. The reversal of 642136177 is 771631246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616975921 + 25160256 = 24839^2 + 5016^2 .

It is a cyclic number.

It is not a de Polignac number, because 642136177 - 2³ = 642136169 is a prime.

It is a super-3 number, since 3×642136177³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (642116177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321068088 + 321068089.

It is an arithmetic number, because the mean of its divisors is an integer number (321068089).

Almost surely, 2^642136177 is an apocalyptic number.

It is an amenable number.

642136177 is a deficient number, since it is larger than the sum of its proper divisors (1).

642136177 is an equidigital number, since it uses as much as digits as its factorization.

642136177 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The square root of 642136177 is about 25340.4060149004. The cubic root of 642136177 is about 862.7316141117.

The spelling of 642136177 in words is "six hundred forty-two million, one hundred thirty-six thousand, one hundred seventy-seven".