264787621193 has 2 divisors, whose sum is σ = 264787621194. Its totient is φ = 264787621192.

The previous prime is 264787621171. The next prime is 264787621211. The reversal of 264787621193 is 391126787462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177888245824 + 86899375369 = 421768^2 + 294787^2 .

It is a cyclic number.

It is not a de Polignac number, because 264787621193 - 2¹⁰ = 264787620169 is a prime.

It is a super-2 number, since 2×264787621193² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (264787621093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132393810596 + 132393810597.

It is an arithmetic number, because the mean of its divisors is an integer number (132393810597).

Almost surely, 2^264787621193 is an apocalyptic number.

It is an amenable number.

264787621193 is a deficient number, since it is larger than the sum of its proper divisors (1).

264787621193 is an equidigital number, since it uses as much as digits as its factorization.

264787621193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 56.

The spelling of 264787621193 in words is "two hundred sixty-four billion, seven hundred eighty-seven million, six hundred twenty-one thousand, one hundred ninety-three".