2161666626454 has 16 divisors (see below), whose sum is σ = 3389874225120. Its totient is φ = 1033840548840.

The previous prime is 2161666626391. The next prime is 2161666626481. The reversal of 2161666626454 is 4546266661612.

It is a super-2 number, since 2×2161666626454² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2161666626395 and 2161666626404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44392257 + ... + 44440924.

It is an arithmetic number, because the mean of its divisors is an integer number (211867139070).

Almost surely, 2^{2161666626454} is an apocalyptic number.

2161666626454 is a deficient number, since it is larger than the sum of its proper divisors (1228207598666).

2161666626454 is an frugal number, since it uses more digits than its factorization.

2161666626454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88833252 (or 88833206 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 55.

The spelling of 2161666626454 in words is "two trillion, one hundred sixty-one billion, six hundred sixty-six million, six hundred twenty-six thousand, four hundred fifty-four".