91640199377380 has 24 divisors (see below), whose sum is σ = 192444748224120. Its totient is φ = 36656016983040.

The previous prime is 91640199377333. The next prime is 91640199377381. The reversal of 91640199377380 is 8377399104619.

It can be written as a sum of positive squares in 4 ways, for example, as 8963988096064 + 82676211281316 = 2993992^2 + 9092646^2 .

It is a super-2 number, since 2×91640199377380² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91640199377381) 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, 9103956 + ... + 16314484.

It is an arithmetic number, because the mean of its divisors is an integer number (8018531176005).

Almost surely, 2^{91640199377380} is an apocalyptic number.

It is an amenable number.

91640199377380 is an abundant number, since it is smaller than the sum of its proper divisors (100804548846740).

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

91640199377380 is a wasteful number, since it uses less digits than its factorization.

91640199377380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7845999 (or 7845997 counting only the distinct ones).

The product of its (nonzero) digits is 61725888, while the sum is 67.

The spelling of 91640199377380 in words is "ninety-one trillion, six hundred forty billion, one hundred ninety-nine million, three hundred seventy-seven thousand, three hundred eighty".