145991893500 has 144 divisors (see below), whose sum is σ = 470355500160. Its totient is φ = 38102793600.

The previous prime is 145991893493. The next prime is 145991893529. The reversal of 145991893500 is 5398199541.

145991893500 is a `hidden beast` number, since 1 + 4 + 59 + 9 + 1 + 89 + 3 + 500 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133635 + ... + 556634.

It is an arithmetic number, because the mean of its divisors is an integer number (3266357640).

Almost surely, 2^145991893500 is an apocalyptic number.

145991893500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145991893500 is an abundant number, since it is smaller than the sum of its proper divisors (324363606660).

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

145991893500 is a wasteful number, since it uses less digits than its factorization.

145991893500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690341 (or 690326 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The spelling of 145991893500 in words is "one hundred forty-five billion, nine hundred ninety-one million, eight hundred ninety-three thousand, five hundred".