2111638466691 has 24 divisors (see below), whose sum is σ = 3427587080736. Its totient is φ = 1242971136000.

The previous prime is 2111638466653. The next prime is 2111638466741. The reversal of 2111638466691 is 1966648361112.

It is not a de Polignac number, because 2111638466691 - 2¹⁴ = 2111638450307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2111638466291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 392349310 + ... + 392354691.

It is an arithmetic number, because the mean of its divisors is an integer number (142816128364).

Almost surely, 2^{2111638466691} is an apocalyptic number.

2111638466691 is a deficient number, since it is larger than the sum of its proper divisors (1315948614045).

2111638466691 is a wasteful number, since it uses less digits than its factorization.

2111638466691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784704043 (or 784704040 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 2111638466691 in words is "two trillion, one hundred eleven billion, six hundred thirty-eight million, four hundred sixty-six thousand, six hundred ninety-one".