20233071256991 has 2 divisors, whose sum is σ = 20233071256992. Its totient is φ = 20233071256990.

The previous prime is 20233071256987. The next prime is 20233071257029. The reversal of 20233071256991 is 19965217033202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20233071256991 - 2² = 20233071256987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20233071256901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10116535628495 + 10116535628496.

It is an arithmetic number, because the mean of its divisors is an integer number (10116535628496).

Almost surely, 2^{20233071256991} is an apocalyptic number.

20233071256991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20233071256991 is an equidigital number, since it uses as much as digits as its factorization.

20233071256991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 20233071256991 in words is "twenty trillion, two hundred thirty-three billion, seventy-one million, two hundred fifty-six thousand, nine hundred ninety-one".