2100646996457 has 2 divisors, whose sum is σ = 2100646996458. Its totient is φ = 2100646996456.

The previous prime is 2100646996453. The next prime is 2100646996489. The reversal of 2100646996457 is 7546996460012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1732227131881 + 368419864576 = 1316141^2 + 606976^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100646996457 - 2² = 2100646996453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100646996396 and 2100646996405.

It is not a weakly prime, because it can be changed into another prime (2100646996451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050323498228 + 1050323498229.

It is an arithmetic number, because the mean of its divisors is an integer number (1050323498229).

Almost surely, 2^{2100646996457} is an apocalyptic number.

It is an amenable number.

2100646996457 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100646996457 is an equidigital number, since it uses as much as digits as its factorization.

2100646996457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 59.

The spelling of 2100646996457 in words is "two trillion, one hundred billion, six hundred forty-six million, nine hundred ninety-six thousand, four hundred fifty-seven".