665355250783 has 2 divisors, whose sum is σ = 665355250784. Its totient is φ = 665355250782.

The previous prime is 665355250709. The next prime is 665355250801. The reversal of 665355250783 is 387052553566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665355250783 - 2²¹ = 665353153631 is a prime.

It is a super-2 number, since 2×665355250783² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665355260783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332677625391 + 332677625392.

It is an arithmetic number, because the mean of its divisors is an integer number (332677625392).

Almost surely, 2^665355250783 is an apocalyptic number.

665355250783 is a deficient number, since it is larger than the sum of its proper divisors (1).

665355250783 is an equidigital number, since it uses as much as digits as its factorization.

665355250783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680000, while the sum is 55.

The spelling of 665355250783 in words is "six hundred sixty-five billion, three hundred fifty-five million, two hundred fifty thousand, seven hundred eighty-three".