81003508790120 has 64 divisors (see below), whose sum is σ = 208480218318720. Its totient is φ = 27747900728064.

The previous prime is 81003508790117. The next prime is 81003508790123. The reversal of 81003508790120 is 2109780530018.

It is an interprime number because it is at equal distance from previous prime (81003508790117) and next prime (81003508790123).

It is a super-2 number, since 2×81003508790120² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81003508790123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128491547 + ... + 129120426.

It is an arithmetic number, because the mean of its divisors is an integer number (3257503411230).

Almost surely, 2^{81003508790120} is an apocalyptic number.

It is an amenable number.

81003508790120 is an abundant number, since it is smaller than the sum of its proper divisors (127476709528600).

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

81003508790120 is a wasteful number, since it uses less digits than its factorization.

81003508790120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257613114 (or 257613110 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 81003508790120 in words is "eighty-one trillion, three billion, five hundred eight million, seven hundred ninety thousand, one hundred twenty".