81366738110 has 64 divisors (see below), whose sum is σ = 177834856320. Its totient is φ = 26207193600.

The previous prime is 81366738083. The next prime is 81366738137. The reversal of 81366738110 is 1183766318.

It is an interprime number because it is at equal distance from previous prime (81366738083) and next prime (81366738137).

It is a super-2 number, since 2×81366738110² (a number of 23 digits) contains 22 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, 466541 + ... + 616760.

It is an arithmetic number, because the mean of its divisors is an integer number (2778669630).

Almost surely, 2^81366738110 is an apocalyptic number.

81366738110 is an abundant number, since it is smaller than the sum of its proper divisors (96468118210).

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

81366738110 is a wasteful number, since it uses less digits than its factorization.

81366738110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083381.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 81366738110 in words is "eighty-one billion, three hundred sixty-six million, seven hundred thirty-eight thousand, one hundred ten".