1851640560 has 480 divisors, whose sum is σ = 8046484992. Its totient is φ = 384445440.

The previous prime is 1851640519. The next prime is 1851640577. The reversal of 1851640560 is 650461581.

1851640560 is a `hidden beast` number, since 1 + 8 + 5 + 1 + 640 + 5 + 6 + 0 = 666.

It is a super-3 number, since 3×1851640560³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1496262 + ... + 1497498.

Almost surely, 2^1851640560 is an apocalyptic number.

1851640560 is a gapful number since it is divisible by the number (10) 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 1851640560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4023242496).

1851640560 is an abundant number, since it is smaller than the sum of its proper divisors (6194844432).

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

1851640560 is a wasteful number, since it uses less digits than its factorization.

1851640560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1851640560 is about 43030.6932316922. The cubic root of 1851640560 is about 1227.9637934201.

It can be divided in two parts, 1851 and 640560, that added together give a triangular number (642411 = T₁₁₃₃).

The spelling of 1851640560 in words is "one billion, eight hundred fifty-one million, six hundred forty thousand, five hundred sixty".