78206919001 has 2 divisors, whose sum is σ = 78206919002. Its totient is φ = 78206919000.

The previous prime is 78206918939. The next prime is 78206919041. The reversal of 78206919001 is 10091960287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60947265625 + 17259653376 = 246875^2 + 131376^2 .

It is an emirp because it is prime and its reverse (10091960287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78206919001 - 2¹³ = 78206910809 is a prime.

It is a super-2 number, since 2×78206919001² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78206919041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39103459500 + 39103459501.

It is an arithmetic number, because the mean of its divisors is an integer number (39103459501).

Almost surely, 2^78206919001 is an apocalyptic number.

It is an amenable number.

78206919001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78206919001 is an equidigital number, since it uses as much as digits as its factorization.

78206919001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 78206919001 in words is "seventy-eight billion, two hundred six million, nine hundred nineteen thousand, one".