2145355657 has 2 divisors, whose sum is σ = 2145355658. Its totient is φ = 2145355656.

The previous prime is 2145355601. The next prime is 2145355661. The reversal of 2145355657 is 7565535412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1678622841 + 466732816 = 40971^2 + 21604^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145355657 - 2⁷ = 2145355529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145355687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072677828 + 1072677829.

It is an arithmetic number, because the mean of its divisors is an integer number (1072677829).

Almost surely, 2^2145355657 is an apocalyptic number.

It is an amenable number.

2145355657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145355657 is an equidigital number, since it uses as much as digits as its factorization.

2145355657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630000, while the sum is 43.

The square root of 2145355657 is about 46317.9841638213. The cubic root of 2145355657 is about 1289.7328647820.

The spelling of 2145355657 in words is "two billion, one hundred forty-five million, three hundred fifty-five thousand, six hundred fifty-seven".