82161400871640 has 64 divisors (see below), whose sum is σ = 246484965692160. Its totient is φ = 21909639070080.

The previous prime is 82161400871633. The next prime is 82161400871701. The reversal of 82161400871640 is 4617800416128.

It is a self number, because there is not a number n which added to its sum of digits gives 82161400871640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46849887 + ... + 48571953.

It is an arithmetic number, because the mean of its divisors is an integer number (3851327588940).

Almost surely, 2^{82161400871640} is an apocalyptic number.

It is an amenable number.

82161400871640 is an abundant number, since it is smaller than the sum of its proper divisors (164323564820520).

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

82161400871640 is a wasteful number, since it uses less digits than its factorization.

82161400871640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2119672 (or 2119668 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 82161400871640 in words is "eighty-two trillion, one hundred sixty-one billion, four hundred million, eight hundred seventy-one thousand, six hundred forty".