2145138373657 has 2 divisors, whose sum is σ = 2145138373658. Its totient is φ = 2145138373656.

The previous prime is 2145138373649. The next prime is 2145138373681. The reversal of 2145138373657 is 7563738315412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1890985267161 + 254153106496 = 1375131^2 + 504136^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145138373657 - 2³ = 2145138373649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2145138373598 and 2145138373607.

It is not a weakly prime, because it can be changed into another prime (2145138373627) 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 as a sum of consecutive naturals, namely, 1072569186828 + 1072569186829.

It is an arithmetic number, because the mean of its divisors is an integer number (1072569186829).

Almost surely, 2^{2145138373657} is an apocalyptic number.

It is an amenable number.

2145138373657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145138373657 is an equidigital number, since it uses as much as digits as its factorization.

2145138373657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12700800, while the sum is 55.

The spelling of 2145138373657 in words is "two trillion, one hundred forty-five billion, one hundred thirty-eight million, three hundred seventy-three thousand, six hundred fifty-seven".