2663661840 has 80 divisors (see below), whose sum is σ = 9436979328. Its totient is φ = 608836608.

The previous prime is 2663661829. The next prime is 2663661853. The reversal of 2663661840 is 481663662.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 2663661792 and 2663661801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791077 + ... + 794436.

Almost surely, 2^2663661840 is an apocalyptic number.

2663661840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2663661840 is an abundant number, since it is smaller than the sum of its proper divisors (6773317488).

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

2663661840 is a wasteful number, since it uses less digits than its factorization.

2663661840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585536 (or 1585530 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 2663661840 is about 51610.6756398325. The cubic root of 2663661840 is about 1386.2014953312.

The spelling of 2663661840 in words is "two billion, six hundred sixty-three million, six hundred sixty-one thousand, eight hundred forty".