155978477 has 8 divisors (see below), whose sum is σ = 162000000. Its totient is φ = 150069664.

The previous prime is 155978461. The next prime is 155978483. The reversal of 155978477 is 774879551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155978477 - 2⁴ = 155978461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155978437) 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, 25352 + ... + 30897.

It is an arithmetic number, because the mean of its divisors is an integer number (20250000).

Almost surely, 2^155978477 is an apocalyptic number.

It is an amenable number.

155978477 is a deficient number, since it is larger than the sum of its proper divisors (6021523).

155978477 is an equidigital number, since it uses as much as digits as its factorization.

155978477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56355.

The product of its digits is 2469600, while the sum is 53.

The square root of 155978477 is about 12489.1343575125. The cubic root of 155978477 is about 538.2965030434.

The spelling of 155978477 in words is "one hundred fifty-five million, nine hundred seventy-eight thousand, four hundred seventy-seven".