3915650085409 has 2 divisors, whose sum is σ = 3915650085410. Its totient is φ = 3915650085408.

The previous prime is 3915650085383. The next prime is 3915650085421. The reversal of 3915650085409 is 9045800565193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2596303803025 + 1319346282384 = 1611305^2 + 1148628^2 .

It is a cyclic number.

It is not a de Polignac number, because 3915650085409 - 2²⁹ = 3915113214497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3915650085409.

It is not a weakly prime, because it can be changed into another prime (3915690085409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1957825042704 + 1957825042705.

It is an arithmetic number, because the mean of its divisors is an integer number (1957825042705).

Almost surely, 2^{3915650085409} is an apocalyptic number.

It is an amenable number.

3915650085409 is a deficient number, since it is larger than the sum of its proper divisors (1).

3915650085409 is an equidigital number, since it uses as much as digits as its factorization.

3915650085409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 55.

The spelling of 3915650085409 in words is "three trillion, nine hundred fifteen billion, six hundred fifty million, eighty-five thousand, four hundred nine".