78160861 has 2 divisors, whose sum is σ = 78160862. Its totient is φ = 78160860.

The previous prime is 78160837. The next prime is 78160891. The reversal of 78160861 is 16806187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 37136836 = 6405^2 + 6094^2 .

It is a cyclic number.

It is not a de Polignac number, because 78160861 - 2¹¹ = 78158813 is a prime.

It is a super-2 number, since 2×78160861² = 12218240384522642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78160861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78160891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39080430 + 39080431.

It is an arithmetic number, because the mean of its divisors is an integer number (39080431).

Almost surely, 2^78160861 is an apocalyptic number.

It is an amenable number.

78160861 is a deficient number, since it is larger than the sum of its proper divisors (1).

78160861 is an equidigital number, since it uses as much as digits as its factorization.

78160861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 78160861 is about 8840.8631365948. The cubic root of 78160861 is about 427.5593862075.

The spelling of 78160861 in words is "seventy-eight million, one hundred sixty thousand, eight hundred sixty-one".