155811606420 has 48 divisors (see below), whose sum is σ = 438487112448. Its totient is φ = 41338846080.

The previous prime is 155811606407. The next prime is 155811606427. The reversal of 155811606420 is 24606118551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155811606427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6579196 + ... + 6602835.

It is an arithmetic number, because the mean of its divisors is an integer number (9135148176).

Almost surely, 2^155811606420 is an apocalyptic number.

155811606420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155811606420 is an abundant number, since it is smaller than the sum of its proper divisors (282675506028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155811606420 is a wasteful number, since it uses less digits than its factorization.

155811606420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13182240 (or 13182238 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 155811606420 in words is "one hundred fifty-five billion, eight hundred eleven million, six hundred six thousand, four hundred twenty".