1285213171500 has 144 divisors (see below), whose sum is σ = 4267809917280. Its totient is φ = 324685411200.

The previous prime is 1285213171499. The next prime is 1285213171573. The reversal of 1285213171500 is 51713125821.

1285213171500 is a `hidden beast` number, since 1 + 2 + 8 + 52 + 1 + 31 + 71 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 7430367 + ... + 7601366.

It is an arithmetic number, because the mean of its divisors is an integer number (29637568870).

Almost surely, 2^{1285213171500} is an apocalyptic number.

1285213171500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285213171500 is an abundant number, since it is smaller than the sum of its proper divisors (2982596745780).

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

1285213171500 is a wasteful number, since it uses less digits than its factorization.

1285213171500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15031777 (or 15031762 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The spelling of 1285213171500 in words is "one trillion, two hundred eighty-five billion, two hundred thirteen million, one hundred seventy-one thousand, five hundred".