78166137 has 16 divisors (see below), whose sum is σ = 120744320. Its totient is φ = 44053632.

The previous prime is 78166129. The next prime is 78166157. The reversal of 78166137 is 73166187.

It is not a de Polignac number, because 78166137 - 2³ = 78166129 is a prime.

It is a super-2 number, since 2×78166137² = 12219889947005538, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78166095 and 78166104.

It is not an unprimeable number, because it can be changed into a prime (78166157) 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 in 15 ways as a sum of consecutive naturals, for example, 23962 + ... + 27027.

It is an arithmetic number, because the mean of its divisors is an integer number (7546520).

Almost surely, 2^78166137 is an apocalyptic number.

It is an amenable number.

78166137 is a deficient number, since it is larger than the sum of its proper divisors (42578183).

78166137 is a wasteful number, since it uses less digits than its factorization.

78166137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51072.

The product of its digits is 42336, while the sum is 39.

The square root of 78166137 is about 8841.1615187146. The cubic root of 78166137 is about 427.5690063360.

The spelling of 78166137 in words is "seventy-eight million, one hundred sixty-six thousand, one hundred thirty-seven".