155928065 has 4 divisors (see below), whose sum is σ = 187113684. Its totient is φ = 124742448.

The previous prime is 155928037. The next prime is 155928077. The reversal of 155928065 is 560829551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560829551 = 1427 ⋅393013.

It can be written as a sum of positive squares in 2 ways, for example, as 85082176 + 70845889 = 9224^2 + 8417^2 .

It is a cyclic number.

It is not a de Polignac number, because 155928065 - 2⁶ = 155928001 is a prime.

It is a super-2 number, since 2×155928065² = 48627122909288450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15592802 + ... + 15592811.

It is an arithmetic number, because the mean of its divisors is an integer number (46778421).

Almost surely, 2^155928065 is an apocalyptic number.

It is an amenable number.

155928065 is a deficient number, since it is larger than the sum of its proper divisors (31185619).

155928065 is an equidigital number, since it uses as much as digits as its factorization.

155928065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31185618.

The product of its (nonzero) digits is 108000, while the sum is 41.

The square root of 155928065 is about 12487.1159600606. The cubic root of 155928065 is about 538.2385045984.

It can be divided in two parts, 1559 and 28065, that multiplied together give a triangular number (43753335 = T₉₃₅₄).

The spelling of 155928065 in words is "one hundred fifty-five million, nine hundred twenty-eight thousand, sixty-five".