20611757433997 has 2 divisors, whose sum is σ = 20611757433998. Its totient is φ = 20611757433996.

The previous prime is 20611757433959. The next prime is 20611757434097. The reversal of 20611757433997 is 79933475711602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15236992164681 + 5374765269316 = 3903459^2 + 2318354^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20611757433997 is a prime.

It is a super-2 number, since 2×20611757433997² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20611757433907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10305878716998 + 10305878716999.

It is an arithmetic number, because the mean of its divisors is an integer number (10305878716999).

Almost surely, 2^{20611757433997} is an apocalyptic number.

It is an amenable number.

20611757433997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20611757433997 is an equidigital number, since it uses as much as digits as its factorization.

20611757433997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60011280, while the sum is 64.

The spelling of 20611757433997 in words is "twenty trillion, six hundred eleven billion, seven hundred fifty-seven million, four hundred thirty-three thousand, nine hundred ninety-seven".