81229275015 has 32 divisors (see below), whose sum is σ = 148707826176. Its totient is φ = 37089809280.

The previous prime is 81229274953. The next prime is 81229275031. The reversal of 81229275015 is 51057292218.

It is not a de Polignac number, because 81229275015 - 2¹³ = 81229266823 is a prime.

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, 363901 + ... + 543030.

It is an arithmetic number, because the mean of its divisors is an integer number (4647119568).

Almost surely, 2^81229275015 is an apocalyptic number.

81229275015 is a deficient number, since it is larger than the sum of its proper divisors (67478551161).

81229275015 is a wasteful number, since it uses less digits than its factorization.

81229275015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907799.

The product of its (nonzero) digits is 100800, while the sum is 42.

The spelling of 81229275015 in words is "eighty-one billion, two hundred twenty-nine million, two hundred seventy-five thousand, fifteen".