2661520551 has 16 divisors (see below), whose sum is σ = 3741292800. Its totient is φ = 1678339008.

The previous prime is 2661520517. The next prime is 2661520567. The reversal of 2661520551 is 1550251662.

It is not a de Polignac number, because 2661520551 - 2⁹ = 2661520039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661520571) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 795 + ... + 72963.

It is an arithmetic number, because the mean of its divisors is an integer number (233830800).

Almost surely, 2^2661520551 is an apocalyptic number.

2661520551 is a deficient number, since it is larger than the sum of its proper divisors (1079772249).

2661520551 is a wasteful number, since it uses less digits than its factorization.

2661520551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72838.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 2661520551 is about 51589.9268365444. The cubic root of 2661520551 is about 1385.8299449454.

The spelling of 2661520551 in words is "two billion, six hundred sixty-one million, five hundred twenty thousand, five hundred fifty-one".