402777326147491 has 2 divisors, whose sum is σ = 402777326147492. Its totient is φ = 402777326147490.

The previous prime is 402777326147489. The next prime is 402777326147509. The reversal of 402777326147491 is 194741623777204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 402777326147491 - 2¹ = 402777326147489 is a prime.

Together with 402777326147489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (402777326147291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201388663073745 + 201388663073746.

It is an arithmetic number, because the mean of its divisors is an integer number (201388663073746).

Almost surely, 2^{402777326147491} is an apocalyptic number.

402777326147491 is a deficient number, since it is larger than the sum of its proper divisors (1).

402777326147491 is an equidigital number, since it uses as much as digits as its factorization.

402777326147491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99574272, while the sum is 64.

The spelling of 402777326147491 in words is "four hundred two trillion, seven hundred seventy-seven billion, three hundred twenty-six million, one hundred forty-seven thousand, four hundred ninety-one".