2161262672657 has 32 divisors (see below), whose sum is σ = 2428551296640. Its totient is φ = 1906733537280.

The previous prime is 2161262672627. The next prime is 2161262672659. The reversal of 2161262672657 is 7562762621612.

It is not a de Polignac number, because 2161262672657 - 2¹² = 2161262668561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161262672599 and 2161262672608.

It is not an unprimeable number, because it can be changed into a prime (2161262672659) 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 31 ways as a sum of consecutive naturals, for example, 24949103 + ... + 25035579.

It is an arithmetic number, because the mean of its divisors is an integer number (75892228020).

Almost surely, 2^{2161262672657} is an apocalyptic number.

It is an amenable number.

2161262672657 is a deficient number, since it is larger than the sum of its proper divisors (267288623983).

2161262672657 is a wasteful number, since it uses less digits than its factorization.

2161262672657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87041.

The product of its digits is 5080320, while the sum is 53.

The spelling of 2161262672657 in words is "two trillion, one hundred sixty-one billion, two hundred sixty-two million, six hundred seventy-two thousand, six hundred fifty-seven".