40638481277 has 2 divisors, whose sum is σ = 40638481278. Its totient is φ = 40638481276.

The previous prime is 40638481253. The next prime is 40638481297. The reversal of 40638481277 is 77218483604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39746801956 + 891679321 = 199366^2 + 29861^2 .

It is a cyclic number.

It is not a de Polignac number, because 40638481277 - 2⁸ = 40638481021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40638481297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319240638 + 20319240639.

It is an arithmetic number, because the mean of its divisors is an integer number (20319240639).

Almost surely, 2^40638481277 is an apocalyptic number.

It is an amenable number.

40638481277 is a deficient number, since it is larger than the sum of its proper divisors (1).

40638481277 is an equidigital number, since it uses as much as digits as its factorization.

40638481277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 40638481277 in words is "forty billion, six hundred thirty-eight million, four hundred eighty-one thousand, two hundred seventy-seven".