155218378 has 12 divisors (see below), whose sum is σ = 270840402. Its totient is φ = 66522120.

The previous prime is 155218339. The next prime is 155218409. The reversal of 155218378 is 873812551.

It can be written as a sum of positive squares in only one way, i.e., 89170249 + 66048129 = 9443^2 + 8127^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 155218378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 791833 + ... + 792028.

Almost surely, 2^155218378 is an apocalyptic number.

155218378 is a deficient number, since it is larger than the sum of its proper divisors (115622024).

155218378 is a wasteful number, since it uses less digits than its factorization.

155218378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583877 (or 1583870 counting only the distinct ones).

The product of its digits is 67200, while the sum is 40.

The square root of 155218378 is about 12458.6667826056. Note that the first 3 decimals coincide. The cubic root of 155218378 is about 537.4206876304.

The spelling of 155218378 in words is "one hundred fifty-five million, two hundred eighteen thousand, three hundred seventy-eight".