2161651641426 has 24 divisors (see below), whose sum is σ = 4762961246160. Its totient is φ = 708337825656.

The previous prime is 2161651641421. The next prime is 2161651641427. The reversal of 2161651641426 is 6241461561612.

2161651641426 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 65 + 164 + 1 + 426 = 666.

It is not an unprimeable number, because it can be changed into a prime (2161651641421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017725700 + ... + 1017727823.

It is an arithmetic number, because the mean of its divisors is an integer number (198456718590).

Almost surely, 2^{2161651641426} is an apocalyptic number.

2161651641426 is an abundant number, since it is smaller than the sum of its proper divisors (2601309604734).

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

2161651641426 is a wasteful number, since it uses less digits than its factorization.

2161651641426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2035453590 (or 2035453587 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 2161651641426 in words is "two trillion, one hundred sixty-one billion, six hundred fifty-one million, six hundred forty-one thousand, four hundred twenty-six".