2181374897654 has 8 divisors (see below), whose sum is σ = 3272076996960. Its totient is φ = 1090682565336.

The previous prime is 2181374897651. The next prime is 2181374897657. The reversal of 2181374897654 is 4567984731812.

It is an interprime number because it is at equal distance from previous prime (2181374897651) and next prime (2181374897657).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×2181374897654² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181374897651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1855214 + ... + 2793665.

It is an arithmetic number, because the mean of its divisors is an integer number (409009624620).

Almost surely, 2^{2181374897654} is an apocalyptic number.

2181374897654 is a deficient number, since it is larger than the sum of its proper divisors (1090702099306).

2181374897654 is a wasteful number, since it uses less digits than its factorization.

2181374897654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4883494.

The product of its digits is 81285120, while the sum is 65.

The spelling of 2181374897654 in words is "two trillion, one hundred eighty-one billion, three hundred seventy-four million, eight hundred ninety-seven thousand, six hundred fifty-four".