78117215941 has 2 divisors, whose sum is σ = 78117215942. Its totient is φ = 78117215940.

The previous prime is 78117215851. The next prime is 78117215947. The reversal of 78117215941 is 14951271187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54070200900 + 24047015041 = 232530^2 + 155071^2 .

It is a cyclic number.

It is not a de Polignac number, because 78117215941 - 2¹⁵ = 78117183173 is a prime.

It is a super-2 number, since 2×78117215941² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78117215891 and 78117215900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78117215947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39058607970 + 39058607971.

It is an arithmetic number, because the mean of its divisors is an integer number (39058607971).

Almost surely, 2^78117215941 is an apocalyptic number.

It is an amenable number.

78117215941 is a deficient number, since it is larger than the sum of its proper divisors (1).

78117215941 is an equidigital number, since it uses as much as digits as its factorization.

78117215941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 46.

The spelling of 78117215941 in words is "seventy-eight billion, one hundred seventeen million, two hundred fifteen thousand, nine hundred forty-one".