511664661041 has 2 divisors, whose sum is σ = 511664661042. Its totient is φ = 511664661040.

The previous prime is 511664661037. The next prime is 511664661047. The reversal of 511664661041 is 140166466115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472135268641 + 39529392400 = 687121^2 + 198820^2 .

It is a cyclic number.

It is not a de Polignac number, because 511664661041 - 2² = 511664661037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 511664661041.

It is not a weakly prime, because it can be changed into another prime (511664661047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255832330520 + 255832330521.

It is an arithmetic number, because the mean of its divisors is an integer number (255832330521).

Almost surely, 2^511664661041 is an apocalyptic number.

It is an amenable number.

511664661041 is a deficient number, since it is larger than the sum of its proper divisors (1).

511664661041 is an equidigital number, since it uses as much as digits as its factorization.

511664661041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 511664661041 in words is "five hundred eleven billion, six hundred sixty-four million, six hundred sixty-one thousand, forty-one".