2139474660691 has 4 divisors (see below), whose sum is σ = 2143832043384. Its totient is φ = 2135117278000.

The previous prime is 2139474660647. The next prime is 2139474660707. The reversal of 2139474660691 is 1960664749312.

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

It is a cyclic number.

It is not a de Polignac number, because 2139474660691 - 2⁹ = 2139474660179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139474640691) 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, 2178690610 + ... + 2178691591.

It is an arithmetic number, because the mean of its divisors is an integer number (535958010846).

Almost surely, 2^{2139474660691} is an apocalyptic number.

2139474660691 is a deficient number, since it is larger than the sum of its proper divisors (4357382693).

2139474660691 is an equidigital number, since it uses as much as digits as its factorization.

2139474660691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357382692.

The product of its (nonzero) digits is 11757312, while the sum is 58.

The spelling of 2139474660691 in words is "two trillion, one hundred thirty-nine billion, four hundred seventy-four million, six hundred sixty thousand, six hundred ninety-one".