2661521240 has 48 divisors (see below), whose sum is σ = 6966129600. Its totient is φ = 912520896.

The previous prime is 2661521227. The next prime is 2661521287. The reversal of 2661521240 is 421251662.

It is a super-2 number, since 2×2661521240² = 14167390621942275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 677000 + ... + 680919.

It is an arithmetic number, because the mean of its divisors is an integer number (145127700).

Almost surely, 2^2661521240 is an apocalyptic number.

2661521240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661521240 is an abundant number, since it is smaller than the sum of its proper divisors (4304608360).

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

2661521240 is a wasteful number, since it uses less digits than its factorization.

2661521240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357944 (or 1357933 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2661521240 is about 51589.9335142041. The cubic root of 2661521240 is about 1385.8300645307.

The spelling of 2661521240 in words is "two billion, six hundred sixty-one million, five hundred twenty-one thousand, two hundred forty".