155278805 has 16 divisors (see below), whose sum is σ = 208004544. Its totient is φ = 110302080.

The previous prime is 155278793. The next prime is 155278813. The reversal of 155278805 is 508872551.

155278805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155278805 - 2⁸ = 155278549 is a prime.

It is a super-2 number, since 2×155278805² = 48223014564456050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30464 + ... + 35193.

It is an arithmetic number, because the mean of its divisors is an integer number (13000284).

Almost surely, 2^155278805 is an apocalyptic number.

It is an amenable number.

155278805 is a deficient number, since it is larger than the sum of its proper divisors (52725739).

155278805 is a wasteful number, since it uses less digits than its factorization.

155278805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65716.

The product of its (nonzero) digits is 112000, while the sum is 41.

The square root of 155278805 is about 12461.0916455983. The cubic root of 155278805 is about 537.4904184338.

The spelling of 155278805 in words is "one hundred fifty-five million, two hundred seventy-eight thousand, eight hundred five".