155434985620 has 12 divisors (see below), whose sum is σ = 326413469844. Its totient is φ = 62173994240.

The previous prime is 155434985617. The next prime is 155434985663. The reversal of 155434985620 is 26589434551.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65077030404 + 90357955216 = 255102^2 + 300596^2 .

It is a congruent 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, 3885874621 + ... + 3885874660.

It is an arithmetic number, because the mean of its divisors is an integer number (27201122487).

Almost surely, 2^155434985620 is an apocalyptic number.

155434985620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155434985620 is an abundant number, since it is smaller than the sum of its proper divisors (170978484224).

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

155434985620 is a wasteful number, since it uses less digits than its factorization.

155434985620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771749290 (or 7771749288 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 155434985620 in words is "one hundred fifty-five billion, four hundred thirty-four million, nine hundred eighty-five thousand, six hundred twenty".