2161651641425 has 12 divisors (see below), whose sum is σ = 2796989255040. Its totient is φ = 1654133429520.

The previous prime is 2161651641421. The next prime is 2161651641427. The reversal of 2161651641425 is 5241461561612.

It is not a de Polignac number, because 2161651641425 - 2² = 2161651641421 is a prime.

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, 1879696505 + ... + 1879697654.

It is an arithmetic number, because the mean of its divisors is an integer number (233082437920).

Almost surely, 2^{2161651641425} is an apocalyptic number.

2161651641425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2161651641425 is a deficient number, since it is larger than the sum of its proper divisors (635337613615).

2161651641425 is a wasteful number, since it uses less digits than its factorization.

2161651641425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759394192 (or 3759394187 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The spelling of 2161651641425 in words is "two trillion, one hundred sixty-one billion, six hundred fifty-one million, six hundred forty-one thousand, four hundred twenty-five".