2154680501689 has 27 divisors (see below), whose sum is σ = 2377931975013. Its totient is φ = 1951943841144.

The previous prime is 2154680501681. The next prime is 2154680501693. The reversal of 2154680501689 is 9861050864512.

The square root of 2154680501689 is 1467883.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 2154680501689 - 2³ = 2154680501681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2154680501681) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 641463192 + ... + 641466550.

Almost surely, 2^{2154680501689} is an apocalyptic number.

2154680501689 is the 1467883-rd square number.

2154680501689 is the 733942-nd centered octagonal number.

It is an amenable number.

2154680501689 is a deficient number, since it is larger than the sum of its proper divisors (223251473324).

2154680501689 is an frugal number, since it uses more digits than its factorization.

2154680501689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802 (or 3401 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 2154680501689 in words is "two trillion, one hundred fifty-four billion, six hundred eighty million, five hundred one thousand, six hundred eighty-nine".