2642191987907 has 4 divisors (see below), whose sum is σ = 2644858176576. Its totient is φ = 2639525799240.

The previous prime is 2642191987873. The next prime is 2642191987949. The reversal of 2642191987907 is 7097891912462.

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 2642191987907 - 2²² = 2642187793603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2642191987007) 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, 1333092848 + ... + 1333094829.

It is an arithmetic number, because the mean of its divisors is an integer number (661214544144).

Almost surely, 2^{2642191987907} is an apocalyptic number.

2642191987907 is a deficient number, since it is larger than the sum of its proper divisors (2666188669).

2642191987907 is an equidigital number, since it uses as much as digits as its factorization.

2642191987907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666188668.

The product of its (nonzero) digits is 27433728, while the sum is 65.

The spelling of 2642191987907 in words is "two trillion, six hundred forty-two billion, one hundred ninety-one million, nine hundred eighty-seven thousand, nine hundred seven".