1242670638217 has 2 divisors, whose sum is σ = 1242670638218. Its totient is φ = 1242670638216.

The previous prime is 1242670638203. The next prime is 1242670638221. The reversal of 1242670638217 is 7128360762421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827961685776 + 414708952441 = 909924^2 + 643979^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242670638217 - 2¹¹ = 1242670636169 is a prime.

It is a super-2 number, since 2×1242670638217² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1242670638247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621335319108 + 621335319109.

It is an arithmetic number, because the mean of its divisors is an integer number (621335319109).

Almost surely, 2^{1242670638217} is an apocalyptic number.

It is an amenable number.

1242670638217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242670638217 is an equidigital number, since it uses as much as digits as its factorization.

1242670638217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 1242670638217 in words is "one trillion, two hundred forty-two billion, six hundred seventy million, six hundred thirty-eight thousand, two hundred seventeen".