1265645340457 has 8 divisors (see below), whose sum is σ = 1306572284160. Its totient is φ = 1224724626480.

The previous prime is 1265645340431. The next prime is 1265645340499. The reversal of 1265645340457 is 7540435465621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265645340457 - 2¹⁹ = 1265644816169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1265643340457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1142782 + ... + 1958887.

It is an arithmetic number, because the mean of its divisors is an integer number (163321535520).

Almost surely, 2^{1265645340457} is an apocalyptic number.

It is an amenable number.

1265645340457 is a deficient number, since it is larger than the sum of its proper divisors (40926943703).

1265645340457 is a wasteful number, since it uses less digits than its factorization.

1265645340457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114863.

The product of its (nonzero) digits is 12096000, while the sum is 52.

The spelling of 1265645340457 in words is "one trillion, two hundred sixty-five billion, six hundred forty-five million, three hundred forty thousand, four hundred fifty-seven".