155220671550 has 384 divisors, whose sum is σ = 477329448960. Its totient is φ = 32598720000.

The previous prime is 155220671549. The next prime is 155220671561. The reversal of 155220671550 is 55176022551.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 155220671499 and 155220671508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 175787409 + ... + 175788291.

It is an arithmetic number, because the mean of its divisors is an integer number (1243045440).

Almost surely, 2^155220671550 is an apocalyptic number.

155220671550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155220671550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238664724480).

155220671550 is an abundant number, since it is smaller than the sum of its proper divisors (322108777410).

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

155220671550 is a wasteful number, since it uses less digits than its factorization.

155220671550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 155220671550 in words is "one hundred fifty-five billion, two hundred twenty million, six hundred seventy-one thousand, five hundred fifty".