73905661 has 2 divisors, whose sum is σ = 73905662. Its totient is φ = 73905660.

The previous prime is 73905631. The next prime is 73905673. The reversal of 73905661 is 16650937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70644025 + 3261636 = 8405^2 + 1806^2 .

It is a cyclic number.

It is not a de Polignac number, because 73905661 - 2⁹ = 73905149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73905661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73905631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36952830 + 36952831.

It is an arithmetic number, because the mean of its divisors is an integer number (36952831).

Almost surely, 2^73905661 is an apocalyptic number.

It is an amenable number.

73905661 is a deficient number, since it is larger than the sum of its proper divisors (1).

73905661 is an equidigital number, since it uses as much as digits as its factorization.

73905661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 73905661 is about 8596.8401753202. The cubic root of 73905661 is about 419.6551610156.

The spelling of 73905661 in words is "seventy-three million, nine hundred five thousand, six hundred sixty-one".