2661387519 has 48 divisors (see below), whose sum is σ = 4472506368. Its totient is φ = 1397991168.

The previous prime is 2661387511. The next prime is 2661387529. The reversal of 2661387519 is 9157831662.

It is not a de Polignac number, because 2661387519 - 2³ = 2661387511 is a prime.

It is a super-2 number, since 2×2661387519² = 14165967052577950722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661387511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95074 + ... + 119840.

It is an arithmetic number, because the mean of its divisors is an integer number (93177216).

Almost surely, 2^2661387519 is an apocalyptic number.

2661387519 is a deficient number, since it is larger than the sum of its proper divisors (1811118849).

2661387519 is a wasteful number, since it uses less digits than its factorization.

2661387519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24844 (or 24837 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 2661387519 is about 51588.6374989687. The cubic root of 2661387519 is about 1385.8068550365.

The spelling of 2661387519 in words is "two billion, six hundred sixty-one million, three hundred eighty-seven thousand, five hundred nineteen".