91155837790 has 32 divisors (see below), whose sum is σ = 166796426016. Its totient is φ = 35863726080.

The previous prime is 91155837763. The next prime is 91155837793. The reversal of 91155837790 is 9773855119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91155837793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159867 + ... + 455926.

It is an arithmetic number, because the mean of its divisors is an integer number (5212388313).

Almost surely, 2^91155837790 is an apocalyptic number.

91155837790 is a deficient number, since it is larger than the sum of its proper divisors (75640588226).

91155837790 is a wasteful number, since it uses less digits than its factorization.

91155837790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616044.

The product of its (nonzero) digits is 2381400, while the sum is 55.

The spelling of 91155837790 in words is "ninety-one billion, one hundred fifty-five million, eight hundred thirty-seven thousand, seven hundred ninety".