73920661 has 2 divisors, whose sum is σ = 73920662. Its totient is φ = 73920660.

The previous prime is 73920619. The next prime is 73920701. The reversal of 73920661 is 16602937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68790436 + 5130225 = 8294^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 73920661 - 2¹³ = 73912469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73927661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36960330 + 36960331.

It is an arithmetic number, because the mean of its divisors is an integer number (36960331).

Almost surely, 2^73920661 is an apocalyptic number.

It is an amenable number.

73920661 is a deficient number, since it is larger than the sum of its proper divisors (1).

73920661 is an equidigital number, since it uses as much as digits as its factorization.

73920661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 73920661 is about 8597.7125446249. The cubic root of 73920661 is about 419.6835503681.

The spelling of 73920661 in words is "seventy-three million, nine hundred twenty thousand, six hundred sixty-one".