1264816587901 has 2 divisors, whose sum is σ = 1264816587902. Its totient is φ = 1264816587900.

The previous prime is 1264816587851. The next prime is 1264816587941. The reversal of 1264816587901 is 1097856184621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1240472475225 + 24344112676 = 1113765^2 + 156026^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264816587901 - 2²³ = 1264808199293 is a prime.

It is a super-2 number, since 2×1264816587901² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1264816587941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632408293950 + 632408293951.

It is an arithmetic number, because the mean of its divisors is an integer number (632408293951).

Almost surely, 2^{1264816587901} is an apocalyptic number.

It is an amenable number.

1264816587901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264816587901 is an equidigital number, since it uses as much as digits as its factorization.

1264816587901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 1264816587901 in words is "one trillion, two hundred sixty-four billion, eight hundred sixteen million, five hundred eighty-seven thousand, nine hundred one".