155999805213 has 32 divisors (see below), whose sum is σ = 239125775616. Its totient is φ = 88614586368.

The previous prime is 155999805179. The next prime is 155999805229. The reversal of 155999805213 is 312508999551.

It is a happy number.

It is not a de Polignac number, because 155999805213 - 2¹³ = 155999797021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155999805233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2993145 + ... + 3044817.

It is an arithmetic number, because the mean of its divisors is an integer number (7472680488).

Almost surely, 2^155999805213 is an apocalyptic number.

It is an amenable number.

155999805213 is a deficient number, since it is larger than the sum of its proper divisors (83125970403).

155999805213 is a wasteful number, since it uses less digits than its factorization.

155999805213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52533.

The product of its (nonzero) digits is 4374000, while the sum is 57.

The spelling of 155999805213 in words is "one hundred fifty-five billion, nine hundred ninety-nine million, eight hundred five thousand, two hundred thirteen".