74661216647 has 2 divisors, whose sum is σ = 74661216648. Its totient is φ = 74661216646.

The previous prime is 74661216599. The next prime is 74661216697.

It is a happy number.

74661216647 is nontrivially palindromic in base 10.

It is an a-pointer prime, because the next prime (74661216697) can be obtained adding 74661216647 to its sum of digits (50).

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 74661216647 - 2⁶ = 74661216583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 74661216595 and 74661216604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74661216697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37330608323 + 37330608324.

It is an arithmetic number, because the mean of its divisors is an integer number (37330608324).

Almost surely, 2^74661216647 is an apocalyptic number.

74661216647 is a deficient number, since it is larger than the sum of its proper divisors (1).

74661216647 is an equidigital number, since it uses as much as digits as its factorization.

74661216647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 50.

The spelling of 74661216647 in words is "seventy-four billion, six hundred sixty-one million, two hundred sixteen thousand, six hundred forty-seven".