1869722120656 has 80 divisors (see below), whose sum is σ = 4020949549008. Its totient is φ = 836636774400.

The previous prime is 1869722120647. The next prime is 1869722120663. The reversal of 1869722120656 is 6560212279681.

It can be written as a sum of positive squares in 8 ways, for example, as 171694209600 + 1698027911056 = 414360^2 + 1303084^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1869722120597 and 1869722120606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1730286 + ... + 2594866.

Almost surely, 2^{1869722120656} is an apocalyptic number.

1869722120656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1869722120656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2010474774504).

1869722120656 is an abundant number, since it is smaller than the sum of its proper divisors (2151227428352).

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

1869722120656 is a wasteful number, since it uses less digits than its factorization.

1869722120656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864920 (or 864914 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 1869722120656 in words is "one trillion, eight hundred sixty-nine billion, seven hundred twenty-two million, one hundred twenty thousand, six hundred fifty-six".