40604312125661 has 2 divisors, whose sum is σ = 40604312125662. Its totient is φ = 40604312125660.

The previous prime is 40604312125561. The next prime is 40604312125679. The reversal of 40604312125661 is 16652121340604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33497124028900 + 7107188096761 = 5787670^2 + 2665931^2 .

It is a cyclic number.

It is not a de Polignac number, because 40604312125661 - 2⁴² = 36206265614557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40604312125561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20302156062830 + 20302156062831.

It is an arithmetic number, because the mean of its divisors is an integer number (20302156062831).

Almost surely, 2^{40604312125661} is an apocalyptic number.

It is an amenable number.

40604312125661 is a deficient number, since it is larger than the sum of its proper divisors (1).

40604312125661 is an equidigital number, since it uses as much as digits as its factorization.

40604312125661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 40604312125661 in words is "forty trillion, six hundred four billion, three hundred twelve million, one hundred twenty-five thousand, six hundred sixty-one".