149681816550 has 432 divisors, whose sum is σ = 487490562000. Its totient is φ = 32790643200.

The previous prime is 149681816527. The next prime is 149681816621. The reversal of 149681816550 is 55618186941.

149681816550 is a `hidden beast` number, since 1 + 4 + 9 + 6 + 8 + 1 + 81 + 6 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 95277265 + ... + 95278835.

It is an arithmetic number, because the mean of its divisors is an integer number (1128450375).

Almost surely, 2^149681816550 is an apocalyptic number.

149681816550 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 149681816550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243745281000).

149681816550 is an abundant number, since it is smaller than the sum of its proper divisors (337808745450).

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

149681816550 is a wasteful number, since it uses less digits than its factorization.

149681816550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781 (or 1766 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 149681816550 in words is "one hundred forty-nine billion, six hundred eighty-one million, eight hundred sixteen thousand, five hundred fifty".