74937661 has 2 divisors, whose sum is σ = 74937662. Its totient is φ = 74937660.

The previous prime is 74937659. The next prime is 74937671. The reversal of 74937661 is 16673947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66928761 + 8008900 = 8181^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 74937661 - 2¹ = 74937659 is a prime.

Together with 74937659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74937631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37468830 + 37468831.

It is an arithmetic number, because the mean of its divisors is an integer number (37468831).

Almost surely, 2^74937661 is an apocalyptic number.

It is an amenable number.

74937661 is a deficient number, since it is larger than the sum of its proper divisors (1).

74937661 is an equidigital number, since it uses as much as digits as its factorization.

74937661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 43.

The square root of 74937661 is about 8656.6541458002. The cubic root of 74937661 is about 421.5994585992.

The spelling of 74937661 in words is "seventy-four million, nine hundred thirty-seven thousand, six hundred sixty-one".