4951991443520 has 168 divisors, whose sum is σ = 12965124053952. Its totient is φ = 1800203637760.

The previous prime is 4951991443519. The next prime is 4951991443523. The reversal of 4951991443520 is 253441991594.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (4951991443523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149558807 + ... + 149591913.

It is an arithmetic number, because the mean of its divisors is an integer number (77173357464).

Almost surely, 2^{4951991443520} is an apocalyptic number.

4951991443520 is a gapful number since it is divisible by the number (40) 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 4951991443520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6482562026976).

4951991443520 is an abundant number, since it is smaller than the sum of its proper divisors (8013132610432).

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

4951991443520 is a wasteful number, since it uses less digits than its factorization.

4951991443520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37009 (or 36988 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 56.

The spelling of 4951991443520 in words is "four trillion, nine hundred fifty-one billion, nine hundred ninety-one million, four hundred forty-three thousand, five hundred twenty".