1265645340456 has 96 divisors (see below), whose sum is σ = 3683039724000. Its totient is φ = 361383410304.

The previous prime is 1265645340431. The next prime is 1265645340499. The reversal of 1265645340456 is 6540435465621.

It is a junction number, because it is equal to n+sod(n) for n = 1265645340399 and 1265645340408.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1516110 + ... + 2197698.

It is an arithmetic number, because the mean of its divisors is an integer number (38364997125).

Almost surely, 2^{1265645340456} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265645340456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1841519862000).

1265645340456 is an abundant number, since it is smaller than the sum of its proper divisors (2417394383544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265645340456 is a wasteful number, since it uses less digits than its factorization.

1265645340456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683191 (or 683180 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 51.

The spelling of 1265645340456 in words is "one trillion, two hundred sixty-five billion, six hundred forty-five million, three hundred forty thousand, four hundred fifty-six".