2661605412139 has 4 divisors (see below), whose sum is σ = 2662245687024. Its totient is φ = 2660965137256.

The previous prime is 2661605412121. The next prime is 2661605412157. The reversal of 2661605412139 is 9312145061662.

2661605412139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2661605412121) and next prime (2661605412157).

It is a cyclic number.

It is not a de Polignac number, because 2661605412139 - 2¹⁷ = 2661605281067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661605412839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320131207 + ... + 320139520.

It is an arithmetic number, because the mean of its divisors is an integer number (665561421756).

Almost surely, 2^{2661605412139} is an apocalyptic number.

2661605412139 is a deficient number, since it is larger than the sum of its proper divisors (640274885).

2661605412139 is an equidigital number, since it uses as much as digits as its factorization.

2661605412139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640274884.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 2661605412139 in words is "two trillion, six hundred sixty-one billion, six hundred five million, four hundred twelve thousand, one hundred thirty-nine".