665576141 has 2 divisors, whose sum is σ = 665576142. Its totient is φ = 665576140.

The previous prime is 665576111. The next prime is 665576147. The reversal of 665576141 is 141675566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 553660900 + 111915241 = 23530^2 + 10579^2 .

It is a cyclic number.

It is not a de Polignac number, because 665576141 - 2⁶ = 665576077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665576147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332788070 + 332788071.

It is an arithmetic number, because the mean of its divisors is an integer number (332788071).

Almost surely, 2^665576141 is an apocalyptic number.

It is an amenable number.

665576141 is a deficient number, since it is larger than the sum of its proper divisors (1).

665576141 is an equidigital number, since it uses as much as digits as its factorization.

665576141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 665576141 is about 25798.7623927971. The cubic root of 665576141 is about 873.1038738151.

The spelling of 665576141 in words is "six hundred sixty-five million, five hundred seventy-six thousand, one hundred forty-one".