1861163520 has 160 divisors (see below), whose sum is σ = 6040381248. Its totient is φ = 488767488.

The previous prime is 1861163509. The next prime is 1861163533. The reversal of 1861163520 is 253611681.

It is a tau number, because it is divible by the number of its divisors (160).

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, 512752 + ... + 516368.

Almost surely, 2^1861163520 is an apocalyptic number.

1861163520 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 1861163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3020190624).

1861163520 is an abundant number, since it is smaller than the sum of its proper divisors (4179217728).

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

1861163520 is an equidigital number, since it uses as much as digits as its factorization.

1861163520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710 (or 3694 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1861163520 is about 43141.2044338125. The cubic root of 1861163520 is about 1230.0653280128.

The spelling of 1861163520 in words is "one billion, eight hundred sixty-one million, one hundred sixty-three thousand, five hundred twenty".