1262542680691 has 2 divisors, whose sum is σ = 1262542680692. Its totient is φ = 1262542680690.

The previous prime is 1262542680671. The next prime is 1262542680743. The reversal of 1262542680691 is 1960862452621.

It is an a-pointer prime, because the next prime (1262542680743) can be obtained adding 1262542680691 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1262542680691 - 2²³ = 1262534292083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1262542680671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631271340345 + 631271340346.

It is an arithmetic number, because the mean of its divisors is an integer number (631271340346).

Almost surely, 2^{1262542680691} is an apocalyptic number.

1262542680691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262542680691 is an equidigital number, since it uses as much as digits as its factorization.

1262542680691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 1262542680691 in words is "one trillion, two hundred sixty-two billion, five hundred forty-two million, six hundred eighty thousand, six hundred ninety-one".