115661358421080 has 128 divisors (see below), whose sum is σ = 362183196787200. Its totient is φ = 29492831869952.

The previous prime is 115661358421033. The next prime is 115661358421093. The reversal of 115661358421080 is 80124853166511.

It is a super-3 number, since 3×115661358421080³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2327347 + ... + 15386333.

It is an arithmetic number, because the mean of its divisors is an integer number (2829556224900).

Almost surely, 2^{115661358421080} is an apocalyptic number.

115661358421080 is a gapful number since it is divisible by the number (10) 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 115661358421080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181091598393600).

115661358421080 is an abundant number, since it is smaller than the sum of its proper divisors (246521838366120).

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

115661358421080 is a wasteful number, since it uses less digits than its factorization.

115661358421080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13062233 (or 13062229 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 115661358421080 in words is "one hundred fifteen trillion, six hundred sixty-one billion, three hundred fifty-eight million, four hundred twenty-one thousand, eighty".