1264816587893 has 4 divisors (see below), whose sum is σ = 1280055342048. Its totient is φ = 1249577833740.

The previous prime is 1264816587851. The next prime is 1264816587901. The reversal of 1264816587893 is 3987856184621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1264816587893 - 2³⁴ = 1247636718709 is a prime.

It is a super-2 number, since 2×1264816587893² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264816587823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7619376953 + ... + 7619377118.

It is an arithmetic number, because the mean of its divisors is an integer number (320013835512).

Almost surely, 2^{1264816587893} is an apocalyptic number.

It is an amenable number.

1264816587893 is a deficient number, since it is larger than the sum of its proper divisors (15238754155).

1264816587893 is an equidigital number, since it uses as much as digits as its factorization.

1264816587893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15238754154.

The product of its digits is 139345920, while the sum is 68.

The spelling of 1264816587893 in words is "one trillion, two hundred sixty-four billion, eight hundred sixteen million, five hundred eighty-seven thousand, eight hundred ninety-three".