2154618851044 has 27 divisors (see below), whose sum is σ = 4144587222153. Its totient is φ = 979357526400.

The previous prime is 2154618851029. The next prime is 2154618851053. The reversal of 2154618851044 is 4401588164512.

The square root of 2154618851044 is 1467862.

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

It can be written as a sum of positive squares in only one way, i.e., 965821148644 + 1188797702400 = 982762^2 + 1090320^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 32259604 + ... + 32326324.

Almost surely, 2^{2154618851044} is an apocalyptic number.

2154618851044 is the 1467862-nd square number.

It is an amenable number.

2154618851044 is a deficient number, since it is larger than the sum of its proper divisors (1989968371109).

2154618851044 is an frugal number, since it uses more digits than its factorization.

2154618851044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133468 (or 66734 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 49.

Multiplying 2154618851044 by its sum of digits (49), we get a square (105576323701156 = 10275034²).

The spelling of 2154618851044 in words is "two trillion, one hundred fifty-four billion, six hundred eighteen million, eight hundred fifty-one thousand, forty-four".