74821647893 has 4 divisors (see below), whose sum is σ = 75768757440. Its totient is φ = 73874538348.

The previous prime is 74821647869. The next prime is 74821647991. The reversal of 74821647893 is 39874612847.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 39874612847 = 101 ⋅394798147.

It is a cyclic number.

It is not a de Polignac number, because 74821647893 - 2¹⁰ = 74821646869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74821647793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473554655 + ... + 473554812.

It is an arithmetic number, because the mean of its divisors is an integer number (18942189360).

Almost surely, 2^74821647893 is an apocalyptic number.

It is an amenable number.

74821647893 is a deficient number, since it is larger than the sum of its proper divisors (947109547).

74821647893 is an equidigital number, since it uses as much as digits as its factorization.

74821647893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947109546.

The product of its digits is 16257024, while the sum is 59.

The spelling of 74821647893 in words is "seventy-four billion, eight hundred twenty-one million, six hundred forty-seven thousand, eight hundred ninety-three".