1991473624530 has 384 divisors, whose sum is σ = 5881826845440. Its totient is φ = 481848238080.

The previous prime is 1991473624499. The next prime is 1991473624633. The reversal of 1991473624530 is 354263741991.

1991473624530 is a `hidden beast` number, since 1 + 9 + 9 + 1 + 4 + 7 + 3 + 624 + 5 + 3 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 763307866 + ... + 763310474.

It is an arithmetic number, because the mean of its divisors is an integer number (15317257410).

Almost surely, 2^{1991473624530} is an apocalyptic number.

1991473624530 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 1991473624530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2940913422720).

1991473624530 is an abundant number, since it is smaller than the sum of its proper divisors (3890353220910).

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

1991473624530 is a wasteful number, since it uses less digits than its factorization.

1991473624530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048 (or 3036 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 1991473624530 in words is "one trillion, nine hundred ninety-one billion, four hundred seventy-three million, six hundred twenty-four thousand, five hundred thirty".