2091567981651 has 16 divisors (see below), whose sum is σ = 2895909707040. Its totient is φ = 1341734215680.

The previous prime is 2091567981583. The next prime is 2091567981661. The reversal of 2091567981651 is 1561897651902.

It is a happy number.

It is not a de Polignac number, because 2091567981651 - 2⁷ = 2091567981523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2091567981661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116461006 + ... + 116478963.

It is an arithmetic number, because the mean of its divisors is an integer number (180994356690).

Almost surely, 2^{2091567981651} is an apocalyptic number.

2091567981651 is a deficient number, since it is larger than the sum of its proper divisors (804341725389).

2091567981651 is a wasteful number, since it uses less digits than its factorization.

2091567981651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232940086.

The product of its (nonzero) digits is 8164800, while the sum is 60.

The spelling of 2091567981651 in words is "two trillion, ninety-one billion, five hundred sixty-seven million, nine hundred eighty-one thousand, six hundred fifty-one".