155051978 has 16 divisors (see below), whose sum is σ = 241337544. Its totient is φ = 74649600.

The previous prime is 155051969. The next prime is 155051983. The reversal of 155051978 is 879150551.

It can be written as a sum of positive squares in 4 ways, for example, as 154828249 + 223729 = 12443^2 + 473^2 .

It is a super-2 number, since 2×155051978² = 48082231763424968, which contains 22 as substring.

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, 3623 + ... + 17978.

Almost surely, 2^155051978 is an apocalyptic number.

155051978 is a deficient number, since it is larger than the sum of its proper divisors (86285566).

155051978 is a wasteful number, since it uses less digits than its factorization.

155051978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21737.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 155051978 is about 12451.9869097265. The cubic root of 155051978 is about 537.2285738293.

The spelling of 155051978 in words is "one hundred fifty-five million, fifty-one thousand, nine hundred seventy-eight".