91221826560 has 176 divisors, whose sum is σ = 292372125696. Its totient is φ = 24275402752.

The previous prime is 91221826517. The next prime is 91221826603. The reversal of 91221826560 is 6562812219.

It is an interprime number because it is at equal distance from previous prime (91221826517) and next prime (91221826603).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7720177 + ... + 7731983.

Almost surely, 2^91221826560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91221826560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146186062848).

91221826560 is an abundant number, since it is smaller than the sum of its proper divisors (201150299136).

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

91221826560 is a wasteful number, since it uses less digits than its factorization.

91221826560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12338 (or 12320 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 91221826560 in words is "ninety-one billion, two hundred twenty-one million, eight hundred twenty-six thousand, five hundred sixty".