91151863488 has 420 divisors, whose sum is σ = 315891428160. Its totient is φ = 25913115648.

The previous prime is 91151863487. The next prime is 91151863549. The reversal of 91151863488 is 88436815119.

It is a happy number.

91151863488 is a `hidden beast` number, since 9 + 1 + 151 + 8 + 6 + 3 + 488 = 666.

It is a super-2 number, since 2×91151863488² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (91151863487) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 58168881 + ... + 58170447.

It is an arithmetic number, because the mean of its divisors is an integer number (752122448).

Almost surely, 2^91151863488 is an apocalyptic number.

91151863488 is a gapful number since it is divisible by the number (98) 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 91151863488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157945714080).

91151863488 is an abundant number, since it is smaller than the sum of its proper divisors (224739564672).

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

91151863488 is a wasteful number, since it uses less digits than its factorization.

91151863488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834 (or 1808 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The spelling of 91151863488 in words is "ninety-one billion, one hundred fifty-one million, eight hundred sixty-three thousand, four hundred eighty-eight".