78162157 has 2 divisors, whose sum is σ = 78162158. Its totient is φ = 78162156.

The previous prime is 78162137. The next prime is 78162173. The reversal of 78162157 is 75126187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 24740676 = 7309^2 + 4974^2 .

It is a cyclic number.

It is not a de Polignac number, because 78162157 - 2¹¹ = 78160109 is a prime.

It is a super-2 number, since 2×78162157² = 12218645573785298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78162137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39081078 + 39081079.

It is an arithmetic number, because the mean of its divisors is an integer number (39081079).

Almost surely, 2^78162157 is an apocalyptic number.

It is an amenable number.

78162157 is a deficient number, since it is larger than the sum of its proper divisors (1).

78162157 is an equidigital number, since it uses as much as digits as its factorization.

78162157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 37.

The square root of 78162157 is about 8840.9364323017. The cubic root of 78162157 is about 427.5617493421.

The spelling of 78162157 in words is "seventy-eight million, one hundred sixty-two thousand, one hundred fifty-seven".