1265028649311 has 16 divisors (see below), whose sum is σ = 1932469855488. Its totient is φ = 721070832000.

The previous prime is 1265028649307. The next prime is 1265028649331. The reversal of 1265028649311 is 1139468205621.

It is not a de Polignac number, because 1265028649311 - 2² = 1265028649307 is a prime.

It is a super-2 number, since 2×1265028649311² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265028649331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75103125 + ... + 75119966.

It is an arithmetic number, because the mean of its divisors is an integer number (120779365968).

Almost surely, 2^{1265028649311} is an apocalyptic number.

1265028649311 is a deficient number, since it is larger than the sum of its proper divisors (667441206177).

1265028649311 is a wasteful number, since it uses less digits than its factorization.

1265028649311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150223502.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 1265028649311 in words is "one trillion, two hundred sixty-five billion, twenty-eight million, six hundred forty-nine thousand, three hundred eleven".