1264256405239 has 16 divisors (see below), whose sum is σ = 1352756744640. Its totient is φ = 1178609667840.

The previous prime is 1264256405231. The next prime is 1264256405249. The reversal of 1264256405239 is 9325046524621.

It is a cyclic number.

It is not a de Polignac number, because 1264256405239 - 2³ = 1264256405231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1264256405192 and 1264256405201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264256405231) 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, 267817 + ... + 1612525.

It is an arithmetic number, because the mean of its divisors is an integer number (84547296540).

Almost surely, 2^{1264256405239} is an apocalyptic number.

1264256405239 is a deficient number, since it is larger than the sum of its proper divisors (88500339401).

1264256405239 is a wasteful number, since it uses less digits than its factorization.

1264256405239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345770.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 1264256405239 in words is "one trillion, two hundred sixty-four billion, two hundred fifty-six million, four hundred five thousand, two hundred thirty-nine".