1772426137681 has 2 divisors, whose sum is σ = 1772426137682. Its totient is φ = 1772426137680.

The previous prime is 1772426137679. The next prime is 1772426137711. The reversal of 1772426137681 is 1867316242771.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1750635949456 + 21790188225 = 1323116^2 + 147615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1772426137681 - 2¹ = 1772426137679 is a prime.

It is a super-2 number, since 2×1772426137681² (a number of 25 digits) contains 22 as substring.

Together with 1772426137679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1772426137661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 886213068840 + 886213068841.

It is an arithmetic number, because the mean of its divisors is an integer number (886213068841).

Almost surely, 2^{1772426137681} is an apocalyptic number.

It is an amenable number.

1772426137681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1772426137681 is an equidigital number, since it uses as much as digits as its factorization.

1772426137681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4741632, while the sum is 55.

The spelling of 1772426137681 in words is "one trillion, seven hundred seventy-two billion, four hundred twenty-six million, one hundred thirty-seven thousand, six hundred eighty-one".