2661503440 has 40 divisors (see below), whose sum is σ = 6236743680. Its totient is φ = 1056214656.

The previous prime is 2661503431. The next prime is 2661503441. The reversal of 2661503440 is 443051662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×2661503440² = 14167201122263667200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661503441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120820 + ... + 141139.

It is an arithmetic number, because the mean of its divisors is an integer number (155918592).

Almost surely, 2^2661503440 is an apocalyptic number.

2661503440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661503440 is an abundant number, since it is smaller than the sum of its proper divisors (3575240240).

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

2661503440 is a wasteful number, since it uses less digits than its factorization.

2661503440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262099 (or 262093 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 2661503440 is about 51589.7609996402. The cubic root of 2661503440 is about 1385.8269750908.

The spelling of 2661503440 in words is "two billion, six hundred sixty-one million, five hundred three thousand, four hundred forty".