2173018978654 has 16 divisors (see below), whose sum is σ = 3339071055936. Its totient is φ = 1059995958400.

The previous prime is 2173018978631. The next prime is 2173018978657. The reversal of 2173018978654 is 4568798103712.

It is a super-2 number, since 2×2173018978654² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2173018978592 and 2173018978601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173018978657) 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 7 ways as a sum of consecutive naturals, for example, 10767234 + ... + 10967194.

It is an arithmetic number, because the mean of its divisors is an integer number (208691940996).

It is a 1-persistent number, because it is pandigital, but 2⋅2173018978654 = 4346037957308 is not.

Almost surely, 2^{2173018978654} is an apocalyptic number.

2173018978654 is a deficient number, since it is larger than the sum of its proper divisors (1166052077282).

2173018978654 is a wasteful number, since it uses less digits than its factorization.

2173018978654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332531.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 2173018978654 in words is "two trillion, one hundred seventy-three billion, eighteen million, nine hundred seventy-eight thousand, six hundred fifty-four".