1889970556644 has 27 divisors (see below), whose sum is σ = 4777446424387. Its totient is φ = 629987436024.

The previous prime is 1889970556637. The next prime is 1889970556709. The reversal of 1889970556644 is 4466550799881.

The square root of 1889970556644 is 1374762.

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

1889970556644 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 9 + 7 + 0 + 556 + 64 + 4 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8134009 + ... + 8363135.

Almost surely, 2^{1889970556644} is an apocalyptic number.

1889970556644 is the 1374762-nd square number.

It is an amenable number.

1889970556644 is an abundant number, since it is smaller than the sum of its proper divisors (2887475867743).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1889970556644 is an frugal number, since it uses more digits than its factorization.

1889970556644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458264 (or 229132 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 72.

The spelling of 1889970556644 in words is "one trillion, eight hundred eighty-nine billion, nine hundred seventy million, five hundred fifty-six thousand, six hundred forty-four".