155265861 has 4 divisors (see below), whose sum is σ = 207021152. Its totient is φ = 103510572.

The previous prime is 155265857. The next prime is 155265883. The reversal of 155265861 is 168562551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 168562551 = 3 ⋅56187517.

It is not a de Polignac number, because 155265861 - 2² = 155265857 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 (155265821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25877641 + ... + 25877646.

It is an arithmetic number, because the mean of its divisors is an integer number (51755288).

Almost surely, 2^155265861 is an apocalyptic number.

It is an amenable number.

155265861 is a deficient number, since it is larger than the sum of its proper divisors (51755291).

155265861 is an equidigital number, since it uses as much as digits as its factorization.

155265861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51755290.

The product of its digits is 72000, while the sum is 39.

The square root of 155265861 is about 12460.5722581268. The cubic root of 155265861 is about 537.4754829993.

The spelling of 155265861 in words is "one hundred fifty-five million, two hundred sixty-five thousand, eight hundred sixty-one".