201087656591 has 2 divisors, whose sum is σ = 201087656592. Its totient is φ = 201087656590.

The previous prime is 201087656579. The next prime is 201087656603. The reversal of 201087656591 is 195656780102.

It is a balanced prime because it is at equal distance from previous prime (201087656579) and next prime (201087656603).

It is a cyclic number.

It is not a de Polignac number, because 201087656591 - 2²⁶ = 201020547727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201087616591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100543828295 + 100543828296.

It is an arithmetic number, because the mean of its divisors is an integer number (100543828296).

Almost surely, 2^201087656591 is an apocalyptic number.

201087656591 is a deficient number, since it is larger than the sum of its proper divisors (1).

201087656591 is an equidigital number, since it uses as much as digits as its factorization.

201087656591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 201087656591 in words is "two hundred one billion, eighty-seven million, six hundred fifty-six thousand, five hundred ninety-one".