1262640712643 has 4 divisors (see below), whose sum is σ = 1269050056560. Its totient is φ = 1256231368728.

The previous prime is 1262640712637. The next prime is 1262640712661. The reversal of 1262640712643 is 3462170462621.

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

It is a cyclic number.

It is not a de Polignac number, because 1262640712643 - 2²⁶ = 1262573603779 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1262640712594 and 1262640712603.

It is not an unprimeable number, because it can be changed into a prime (1262640712633) 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, 3204671663 + ... + 3204672056.

It is an arithmetic number, because the mean of its divisors is an integer number (317262514140).

Almost surely, 2^{1262640712643} is an apocalyptic number.

1262640712643 is a deficient number, since it is larger than the sum of its proper divisors (6409343917).

1262640712643 is an equidigital number, since it uses as much as digits as its factorization.

1262640712643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6409343916.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 1262640712643 in words is "one trillion, two hundred sixty-two billion, six hundred forty million, seven hundred twelve thousand, six hundred forty-three".