1261426387477 has 2 divisors, whose sum is σ = 1261426387478. Its totient is φ = 1261426387476.

The previous prime is 1261426387453. The next prime is 1261426387483. The reversal of 1261426387477 is 7747836241621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 925778806276 + 335647581201 = 962174^2 + 579351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261426387477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261426385477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630713193738 + 630713193739.

It is an arithmetic number, because the mean of its divisors is an integer number (630713193739).

Almost surely, 2^{1261426387477} is an apocalyptic number.

It is an amenable number.

1261426387477 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261426387477 is an equidigital number, since it uses as much as digits as its factorization.

1261426387477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18966528, while the sum is 58.

The spelling of 1261426387477 in words is "one trillion, two hundred sixty-one billion, four hundred twenty-six million, three hundred eighty-seven thousand, four hundred seventy-seven".