81406455324 has 24 divisors (see below), whose sum is σ = 190179781008. Its totient is φ = 27102430080.

The previous prime is 81406455293. The next prime is 81406455337. The reversal of 81406455324 is 42355460418.

It is a super-3 number, since 3×81406455324³ (a number of 34 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 7 ways as a sum of consecutive naturals, for example, 4121617 + ... + 4141320.

It is an arithmetic number, because the mean of its divisors is an integer number (7924157542).

Almost surely, 2^81406455324 is an apocalyptic number.

It is an amenable number.

81406455324 is an abundant number, since it is smaller than the sum of its proper divisors (108773325684).

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

81406455324 is a wasteful number, since it uses less digits than its factorization.

81406455324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8263765 (or 8263763 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 42.

The spelling of 81406455324 in words is "eighty-one billion, four hundred six million, four hundred fifty-five thousand, three hundred twenty-four".