98721355823 has 4 divisors (see below), whose sum is σ = 100584022968. Its totient is φ = 96858688680.

The previous prime is 98721355783. The next prime is 98721355829. The reversal of 98721355823 is 32855312789.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 98721355823 - 2¹⁴ = 98721339439 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 1862667091 = 98721355823 / (9 + 8 + 7 + 2 + 1 + 3 + 5 + 5 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98721355829) 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, 931333493 + ... + 931333598.

It is an arithmetic number, because the mean of its divisors is an integer number (25146005742).

Almost surely, 2^98721355823 is an apocalyptic number.

98721355823 is a deficient number, since it is larger than the sum of its proper divisors (1862667145).

98721355823 is a wasteful number, since it uses less digits than its factorization.

98721355823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862667144.

The product of its digits is 3628800, while the sum is 53.

The spelling of 98721355823 in words is "ninety-eight billion, seven hundred twenty-one million, three hundred fifty-five thousand, eight hundred twenty-three".