155777222 has 16 divisors (see below), whose sum is σ = 250396272. Its totient is φ = 72422400.

The previous prime is 155777213. The next prime is 155777227. The reversal of 155777222 is 222777551.

155777222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155777227) 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 7 ways as a sum of consecutive naturals, for example, 24779 + ... + 30422.

It is an arithmetic number, because the mean of its divisors is an integer number (15649767).

Almost surely, 2^155777222 is an apocalyptic number.

155777222 is a deficient number, since it is larger than the sum of its proper divisors (94619050).

155777222 is a wasteful number, since it uses less digits than its factorization.

155777222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55303.

The product of its digits is 68600, while the sum is 38.

The square root of 155777222 is about 12481.0745530984. The cubic root of 155777222 is about 538.0648867073.

The spelling of 155777222 in words is "one hundred fifty-five million, seven hundred seventy-seven thousand, two hundred twenty-two".