155478725 has 6 divisors (see below), whose sum is σ = 192793650. Its totient is φ = 124382960.

The previous prime is 155478721. The next prime is 155478731. The reversal of 155478725 is 527874551.

It can be written as a sum of positive squares in 3 ways, for example, as 5612161 + 149866564 = 2369^2 + 12242^2 .

It is not a de Polignac number, because 155478725 - 2² = 155478721 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155478721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3109550 + ... + 3109599.

It is an arithmetic number, because the mean of its divisors is an integer number (32132275).

Almost surely, 2^155478725 is an apocalyptic number.

It is an amenable number.

155478725 is a deficient number, since it is larger than the sum of its proper divisors (37314925).

155478725 is an equidigital number, since it uses as much as digits as its factorization.

155478725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6219159 (or 6219154 counting only the distinct ones).

The product of its digits is 392000, while the sum is 44.

The square root of 155478725 is about 12469.1108343779. The cubic root of 155478725 is about 537.7209907939.

The spelling of 155478725 in words is "one hundred fifty-five million, four hundred seventy-eight thousand, seven hundred twenty-five".