78181385341377 has 32 divisors (see below), whose sum is σ = 110489063952384. Its totient is φ = 49003749734400.

The previous prime is 78181385341369. The next prime is 78181385341399. The reversal of 78181385341377 is 77314358318187.

It is not a de Polignac number, because 78181385341377 - 2³ = 78181385341369 is a prime.

It is a super-2 number, since 2×78181385341377² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78181385341877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189540352 + ... + 189952382.

It is an arithmetic number, because the mean of its divisors is an integer number (3452783248512).

Almost surely, 2^{78181385341377} is an apocalyptic number.

It is an amenable number.

78181385341377 is a deficient number, since it is larger than the sum of its proper divisors (32307678611007).

78181385341377 is a wasteful number, since it uses less digits than its factorization.

78181385341377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415929.

The product of its digits is 94832640, while the sum is 66.

The spelling of 78181385341377 in words is "seventy-eight trillion, one hundred eighty-one billion, three hundred eighty-five million, three hundred forty-one thousand, three hundred seventy-seven".