665151555041 has 2 divisors, whose sum is σ = 665151555042. Its totient is φ = 665151555040.

The previous prime is 665151554999. The next prime is 665151555043. The reversal of 665151555041 is 140555151566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 549235138816 + 115916416225 = 741104^2 + 340465^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665151555041 is a prime.

Together with 665151555043, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 665151554983 and 665151555001.

It is not a weakly prime, because it can be changed into another prime (665151555043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332575777520 + 332575777521.

It is an arithmetic number, because the mean of its divisors is an integer number (332575777521).

Almost surely, 2^665151555041 is an apocalyptic number.

It is an amenable number.

665151555041 is a deficient number, since it is larger than the sum of its proper divisors (1).

665151555041 is an equidigital number, since it uses as much as digits as its factorization.

665151555041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 665151555041 in words is "six hundred sixty-five billion, one hundred fifty-one million, five hundred fifty-five thousand, forty-one".