81422137700 has 36 divisors (see below), whose sum is σ = 177871883700. Its totient is φ = 32350266240.

The previous prime is 81422137669. The next prime is 81422137733. The reversal of 81422137700 is 773122418.

It can be written as a sum of positive squares in 6 ways, for example, as 2780031076 + 78642106624 = 52726^2 + 280432^2 .

It is a super-2 number, since 2×81422137700² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2717387 + ... + 2747186.

Almost surely, 2^81422137700 is an apocalyptic number.

It is an amenable number.

81422137700 is an abundant number, since it is smaller than the sum of its proper divisors (96449746000).

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

81422137700 is a wasteful number, since it uses less digits than its factorization.

81422137700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5464736 (or 5464729 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 81422137700 in words is "eighty-one billion, four hundred twenty-two million, one hundred thirty-seven thousand, seven hundred".