74821647991 has 2 divisors, whose sum is σ = 74821647992. Its totient is φ = 74821647990.

The previous prime is 74821647869. The next prime is 74821648003. The reversal of 74821647991 is 19974612847.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74821647991 - 2²⁵ = 74788093559 is a prime.

It is a super-2 number, since 2×74821647991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74821642991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37410823995 + 37410823996.

It is an arithmetic number, because the mean of its divisors is an integer number (37410823996).

Almost surely, 2^74821647991 is an apocalyptic number.

74821647991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74821647991 is an equidigital number, since it uses as much as digits as its factorization.

74821647991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 58.

The spelling of 74821647991 in words is "seventy-four billion, eight hundred twenty-one million, six hundred forty-seven thousand, nine hundred ninety-one".