155238891800 has 48 divisors (see below), whose sum is σ = 361713567600. Its totient is φ = 61960822400.

The previous prime is 155238891767. The next prime is 155238891803. The reversal of 155238891800 is 8198832551.

It is a happy number.

It is a super-2 number, since 2×155238891800² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155238891803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 749660 + ... + 934059.

It is an arithmetic number, because the mean of its divisors is an integer number (7535699325).

Almost surely, 2^155238891800 is an apocalyptic number.

155238891800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155238891800 is an abundant number, since it is smaller than the sum of its proper divisors (206474675800).

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

155238891800 is a wasteful number, since it uses less digits than its factorization.

155238891800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684196 (or 1684187 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 155238891800 in words is "one hundred fifty-five billion, two hundred thirty-eight million, eight hundred ninety-one thousand, eight hundred".