91099474656 has 144 divisors (see below), whose sum is σ = 244039380480. Its totient is φ = 29754743040.

The previous prime is 91099474649. The next prime is 91099474663. The reversal of 91099474656 is 65647499019.

It is an interprime number because it is at equal distance from previous prime (91099474649) and next prime (91099474663).

It is a super-2 number, since 2×91099474656² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91099474656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91926321 + ... + 91927311.

It is an arithmetic number, because the mean of its divisors is an integer number (1694717920).

Almost surely, 2^91099474656 is an apocalyptic number.

91099474656 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91099474656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122019690240).

91099474656 is an abundant number, since it is smaller than the sum of its proper divisors (152939905824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91099474656 is a wasteful number, since it uses less digits than its factorization.

91099474656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 14696640, while the sum is 60.

The spelling of 91099474656 in words is "ninety-one billion, ninety-nine million, four hundred seventy-four thousand, six hundred fifty-six".