1265034345251 has 4 divisors (see below), whose sum is σ = 1286475605400. Its totient is φ = 1243593085104.

The previous prime is 1265034345193. The next prime is 1265034345257. The reversal of 1265034345251 is 1525434305621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265034345251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1265034345199 and 1265034345208.

It is not an unprimeable number, because it can be changed into a prime (1265034345257) 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, 10720629986 + ... + 10720630103.

It is an arithmetic number, because the mean of its divisors is an integer number (321618901350).

Almost surely, 2^{1265034345251} is an apocalyptic number.

1265034345251 is a deficient number, since it is larger than the sum of its proper divisors (21441260149).

1265034345251 is an equidigital number, since it uses as much as digits as its factorization.

1265034345251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21441260148.

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 1265034345251 in words is "one trillion, two hundred sixty-five billion, thirty-four million, three hundred forty-five thousand, two hundred fifty-one".