1210986661500 has 1728 divisors, whose sum is σ = 5260213550592. Its totient is φ = 230985216000.

The previous prime is 1210986661487. The next prime is 1210986661541. The reversal of 1210986661500 is 51666890121.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 1773040159 + ... + 1773040841.

It is an arithmetic number, because the mean of its divisors is an integer number (3044105064).

Almost surely, 2^{1210986661500} is an apocalyptic number.

1210986661500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1210986661500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630106775296).

1210986661500 is an abundant number, since it is smaller than the sum of its proper divisors (4049226889092).

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

1210986661500 is a wasteful number, since it uses less digits than its factorization.

1210986661500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 771 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 1210986661500 in words is "one trillion, two hundred ten billion, nine hundred eighty-six million, six hundred sixty-one thousand, five hundred".