91815720803 has 8 divisors (see below), whose sum is σ = 98035795968. Its totient is φ = 85781319624.

The previous prime is 91815720769. The next prime is 91815720809. The reversal of 91815720803 is 30802751819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91815720803 - 2¹⁴ = 91815704419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91815720809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46417475 + ... + 46419452.

It is an arithmetic number, because the mean of its divisors is an integer number (12254474496).

Almost surely, 2^91815720803 is an apocalyptic number.

91815720803 is a deficient number, since it is larger than the sum of its proper divisors (6220075165).

91815720803 is a wasteful number, since it uses less digits than its factorization.

91815720803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92836993.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 91815720803 in words is "ninety-one billion, eight hundred fifteen million, seven hundred twenty thousand, eight hundred three".