78362215417 has 2 divisors, whose sum is σ = 78362215418. Its totient is φ = 78362215416.

The previous prime is 78362215409. The next prime is 78362215433. The reversal of 78362215417 is 71451226387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77678706681 + 683508736 = 278709^2 + 26144^2 .

It is a cyclic number.

It is not a de Polignac number, because 78362215417 - 2³ = 78362215409 is a prime.

It is a super-2 number, since 2×78362215417² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78362215447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39181107708 + 39181107709.

It is an arithmetic number, because the mean of its divisors is an integer number (39181107709).

Almost surely, 2^78362215417 is an apocalyptic number.

It is an amenable number.

78362215417 is a deficient number, since it is larger than the sum of its proper divisors (1).

78362215417 is an equidigital number, since it uses as much as digits as its factorization.

78362215417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480, while the sum is 46.

The spelling of 78362215417 in words is "seventy-eight billion, three hundred sixty-two million, two hundred fifteen thousand, four hundred seventeen".