1817691149772 has 192 divisors, whose sum is σ = 4892614594560. Its totient is φ = 583170513408.

The previous prime is 1817691149767. The next prime is 1817691149863. The reversal of 1817691149772 is 2779411967181.

1817691149772 is a `hidden beast` number, since 1 + 8 + 1 + 7 + 69 + 11 + 497 + 72 = 666.

It is a super-2 number, since 2×1817691149772² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 573945733 + ... + 573948899.

It is an arithmetic number, because the mean of its divisors is an integer number (25482367680).

Almost surely, 2^{1817691149772} is an apocalyptic number.

1817691149772 is a gapful number since it is divisible by the number (12) 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 1817691149772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2446307297280).

1817691149772 is an abundant number, since it is smaller than the sum of its proper divisors (3074923444788).

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

1817691149772 is a wasteful number, since it uses less digits than its factorization.

1817691149772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4989 (or 4981 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 63.

The spelling of 1817691149772 in words is "one trillion, eight hundred seventeen billion, six hundred ninety-one million, one hundred forty-nine thousand, seven hundred seventy-two".