155705645 has 16 divisors (see below), whose sum is σ = 188777520. Its totient is φ = 123285504.

The previous prime is 155705639. The next prime is 155705663. The reversal of 155705645 is 546507551.

155705645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 14523721 + 141181924 = 3811^2 + 11882^2 .

It is a cyclic number.

It is not a de Polignac number, because 155705645 - 2⁴ = 155705629 is a prime.

It is a super-3 number, since 3×155705645³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155705599 and 155705608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305651 + ... + 306159.

It is an arithmetic number, because the mean of its divisors is an integer number (11798595).

Almost surely, 2^155705645 is an apocalyptic number.

It is an amenable number.

155705645 is a deficient number, since it is larger than the sum of its proper divisors (33071875).

155705645 is a wasteful number, since it uses less digits than its factorization.

155705645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 155705645 is about 12478.2068022613. The cubic root of 155705645 is about 537.9824635090.

The spelling of 155705645 in words is "one hundred fifty-five million, seven hundred five thousand, six hundred forty-five".