155961278 has 16 divisors (see below), whose sum is σ = 255452400. Its totient is φ = 70824000.

The previous prime is 155961269. The next prime is 155961293. The reversal of 155961278 is 872169551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25898 + ... + 31346.

It is an arithmetic number, because the mean of its divisors is an integer number (15965775).

Almost surely, 2^155961278 is an apocalyptic number.

155961278 is a deficient number, since it is larger than the sum of its proper divisors (99491122).

155961278 is a wasteful number, since it uses less digits than its factorization.

155961278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6763.

The product of its digits is 151200, while the sum is 44.

The square root of 155961278 is about 12488.4457800000. The cubic root of 155961278 is about 538.2767171899.

The spelling of 155961278 in words is "one hundred fifty-five million, nine hundred sixty-one thousand, two hundred seventy-eight".