74447951789 has 2 divisors, whose sum is σ = 74447951790. Its totient is φ = 74447951788.

The previous prime is 74447951687. The next prime is 74447951791. The reversal of 74447951789 is 98715974447.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50925594889 + 23522356900 = 225667^2 + 153370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74447951789 is a prime.

It is a super-4 number, since 4×74447951789⁴ (a number of 45 digits) contains 4444 as substring.

Together with 74447951791, 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 (74447951089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37223975894 + 37223975895.

It is an arithmetic number, because the mean of its divisors is an integer number (37223975895).

Almost surely, 2^74447951789 is an apocalyptic number.

It is an amenable number.

74447951789 is a deficient number, since it is larger than the sum of its proper divisors (1).

74447951789 is an equidigital number, since it uses as much as digits as its factorization.

74447951789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71124480, while the sum is 65.

The spelling of 74447951789 in words is "seventy-four billion, four hundred forty-seven million, nine hundred fifty-one thousand, seven hundred eighty-nine".