2661005240 has 64 divisors (see below), whose sum is σ = 6615120960. Its totient is φ = 958228480.

The previous prime is 2661005239. The next prime is 2661005261. The reversal of 2661005240 is 425001662.

It is a congruent number.

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, 69431 + ... + 100710.

It is an arithmetic number, because the mean of its divisors is an integer number (103361265).

Almost surely, 2^2661005240 is an apocalyptic number.

2661005240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661005240 is an abundant number, since it is smaller than the sum of its proper divisors (3954115720).

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

2661005240 is a wasteful number, since it uses less digits than its factorization.

2661005240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170192 (or 170188 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2661005240 is about 51584.9322961657. The cubic root of 2661005240 is about 1385.7404998963.

The spelling of 2661005240 in words is "two billion, six hundred sixty-one million, five thousand, two hundred forty".