74689661 has 2 divisors, whose sum is σ = 74689662. Its totient is φ = 74689660.

The previous prime is 74689639. The next prime is 74689663. The reversal of 74689661 is 16698647.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60295225 + 14394436 = 7765^2 + 3794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74689661 is a prime.

Together with 74689663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74689663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37344830 + 37344831.

It is an arithmetic number, because the mean of its divisors is an integer number (37344831).

Almost surely, 2^74689661 is an apocalyptic number.

It is an amenable number.

74689661 is a deficient number, since it is larger than the sum of its proper divisors (1).

74689661 is an equidigital number, since it uses as much as digits as its factorization.

74689661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 74689661 is about 8642.3180339536. The cubic root of 74689661 is about 421.1338617399.

The spelling of 74689661 in words is "seventy-four million, six hundred eighty-nine thousand, six hundred sixty-one".