71902286745661 has 2 divisors, whose sum is σ = 71902286745662. Its totient is φ = 71902286745660.

The previous prime is 71902286745539. The next prime is 71902286745673. The reversal of 71902286745661 is 16654768220917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71868107980036 + 34178765625 = 8477506^2 + 184875^2 .

It is a cyclic number.

It is not a de Polignac number, because 71902286745661 - 2¹³ = 71902286737469 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71902286745593 and 71902286745602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71902286745461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35951143372830 + 35951143372831.

It is an arithmetic number, because the mean of its divisors is an integer number (35951143372831).

Almost surely, 2^{71902286745661} is an apocalyptic number.

It is an amenable number.

71902286745661 is a deficient number, since it is larger than the sum of its proper divisors (1).

71902286745661 is an equidigital number, since it uses as much as digits as its factorization.

71902286745661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 71902286745661 in words is "seventy-one trillion, nine hundred two billion, two hundred eighty-six million, seven hundred forty-five thousand, six hundred sixty-one".