2157807281461 has 16 divisors (see below), whose sum is σ = 2338167178368. Its totient is φ = 1979538897600.

The previous prime is 2157807281431. The next prime is 2157807281477. The reversal of 2157807281461 is 1641827087512.

It is a cyclic number.

It is not a de Polignac number, because 2157807281461 - 2²⁵ = 2157773727029 is a prime.

It is a super-2 number, since 2×2157807281461² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2157807281399 and 2157807281408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157807281431) 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 15 ways as a sum of consecutive naturals, for example, 573096 + ... + 2155006.

It is an arithmetic number, because the mean of its divisors is an integer number (146135448648).

Almost surely, 2^{2157807281461} is an apocalyptic number.

It is an amenable number.

2157807281461 is a deficient number, since it is larger than the sum of its proper divisors (180359896907).

2157807281461 is a wasteful number, since it uses less digits than its factorization.

2157807281461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582572.

The product of its (nonzero) digits is 1505280, while the sum is 52.

The spelling of 2157807281461 in words is "two trillion, one hundred fifty-seven billion, eight hundred seven million, two hundred eighty-one thousand, four hundred sixty-one".