8540239402477 has 2 divisors, whose sum is σ = 8540239402478. Its totient is φ = 8540239402476.

The previous prime is 8540239402459. The next prime is 8540239402489. The reversal of 8540239402477 is 7742049320458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8452631690281 + 87607712196 = 2907341^2 + 295986^2 .

It is a cyclic number.

It is not a de Polignac number, because 8540239402477 - 2⁷ = 8540239402349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8540239412477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270119701238 + 4270119701239.

It is an arithmetic number, because the mean of its divisors is an integer number (4270119701239).

Almost surely, 2^{8540239402477} is an apocalyptic number.

It is an amenable number.

8540239402477 is a deficient number, since it is larger than the sum of its proper divisors (1).

8540239402477 is an equidigital number, since it uses as much as digits as its factorization.

8540239402477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 8540239402477 in words is "eight trillion, five hundred forty billion, two hundred thirty-nine million, four hundred two thousand, four hundred seventy-seven".