91218011552 has 48 divisors (see below), whose sum is σ = 180090231552. Its totient is φ = 45480983040.

The previous prime is 91218011543. The next prime is 91218011557. The reversal of 91218011552 is 25511081219.

It is not an unprimeable number, because it can be changed into a prime (91218011557) 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, 28801073 + ... + 28804239.

It is an arithmetic number, because the mean of its divisors is an integer number (3751879824).

Almost surely, 2^91218011552 is an apocalyptic number.

It is an amenable number.

91218011552 is a deficient number, since it is larger than the sum of its proper divisors (88872220000).

91218011552 is a wasteful number, since it uses less digits than its factorization.

91218011552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5421 (or 5413 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 35.

The spelling of 91218011552 in words is "ninety-one billion, two hundred eighteen million, eleven thousand, five hundred fifty-two".