78851438201 has 2 divisors, whose sum is σ = 78851438202. Its totient is φ = 78851438200.

The previous prime is 78851438123. The next prime is 78851438207. The reversal of 78851438201 is 10283415887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75459540601 + 3391897600 = 274699^2 + 58240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78851438201 is a prime.

It is a super-2 number, since 2×78851438201² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78851438207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39425719100 + 39425719101.

It is an arithmetic number, because the mean of its divisors is an integer number (39425719101).

Almost surely, 2^78851438201 is an apocalyptic number.

It is an amenable number.

78851438201 is a deficient number, since it is larger than the sum of its proper divisors (1).

78851438201 is an equidigital number, since it uses as much as digits as its factorization.

78851438201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 430080, while the sum is 47.

The spelling of 78851438201 in words is "seventy-eight billion, eight hundred fifty-one million, four hundred thirty-eight thousand, two hundred one".