1265894801079 has 4 divisors (see below), whose sum is σ = 1687859734776. Its totient is φ = 843929867384.

The previous prime is 1265894801057. The next prime is 1265894801117. The reversal of 1265894801079 is 9701084985621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1265894801079 - 2⁸ = 1265894800823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265894801009) 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, 210982466844 + ... + 210982466849.

It is an arithmetic number, because the mean of its divisors is an integer number (421964933694).

Almost surely, 2^{1265894801079} is an apocalyptic number.

1265894801079 is a deficient number, since it is larger than the sum of its proper divisors (421964933697).

1265894801079 is an equidigital number, since it uses as much as digits as its factorization.

1265894801079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421964933696.

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 1265894801079 in words is "one trillion, two hundred sixty-five billion, eight hundred ninety-four million, eight hundred one thousand, seventy-nine".