2154368446691 has 2 divisors, whose sum is σ = 2154368446692. Its totient is φ = 2154368446690.

The previous prime is 2154368446687. The next prime is 2154368446717. The reversal of 2154368446691 is 1966448634512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2154368446691 - 2² = 2154368446687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2154368446691.

It is not a weakly prime, because it can be changed into another prime (2154368446651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077184223345 + 1077184223346.

It is an arithmetic number, because the mean of its divisors is an integer number (1077184223346).

Almost surely, 2^{2154368446691} is an apocalyptic number.

2154368446691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154368446691 is an equidigital number, since it uses as much as digits as its factorization.

2154368446691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29859840, while the sum is 59.

The spelling of 2154368446691 in words is "two trillion, one hundred fifty-four billion, three hundred sixty-eight million, four hundred forty-six thousand, six hundred ninety-one".