40643957554129 has 2 divisors, whose sum is σ = 40643957554130. Its totient is φ = 40643957554128.

The previous prime is 40643957554019. The next prime is 40643957554177. The reversal of 40643957554129 is 92145575934604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34578810140625 + 6065147413504 = 5880375^2 + 2462752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40643957554129 is a prime.

It is not a weakly prime, because it can be changed into another prime (40643957551129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20321978777064 + 20321978777065.

It is an arithmetic number, because the mean of its divisors is an integer number (20321978777065).

Almost surely, 2^{40643957554129} is an apocalyptic number.

It is an amenable number.

40643957554129 is a deficient number, since it is larger than the sum of its proper divisors (1).

40643957554129 is an equidigital number, since it uses as much as digits as its factorization.

40643957554129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296000, while the sum is 64.

The spelling of 40643957554129 in words is "forty trillion, six hundred forty-three billion, nine hundred fifty-seven million, five hundred fifty-four thousand, one hundred twenty-nine".