155638465 has 8 divisors (see below), whose sum is σ = 191814120. Its totient is φ = 121145472.

The previous prime is 155638433. The next prime is 155638477. The reversal of 155638465 is 564836551.

It can be written as a sum of positive squares in 4 ways, for example, as 98545329 + 57093136 = 9927^2 + 7556^2 .

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 155638465 - 2⁵ = 155638433 is a prime.

It is an unprimeable number.

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, 420460 + ... + 420829.

It is an arithmetic number, because the mean of its divisors is an integer number (23976765).

Almost surely, 2^155638465 is an apocalyptic number.

It is an amenable number.

155638465 is a deficient number, since it is larger than the sum of its proper divisors (36175655).

155638465 is an equidigital number, since it uses as much as digits as its factorization.

155638465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841331.

The product of its digits is 432000, while the sum is 43.

The square root of 155638465 is about 12475.5146186440. The cubic root of 155638465 is about 537.9050806134.

The spelling of 155638465 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, four hundred sixty-five".