1207991715840 has 2304 divisors, whose sum is σ = 5678146656000. Its totient is φ = 241458610176.

The previous prime is 1207991715817. The next prime is 1207991715841. The reversal of 1207991715840 is 485171997021.

It is a tau number, because it is divible by the number of its divisors (2304).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1207991715841) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 63578511351 + ... + 63578511369.

It is an arithmetic number, because the mean of its divisors is an integer number (2464473375).

Almost surely, 2^{1207991715840} is an apocalyptic number.

1207991715840 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 1207991715840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2839073328000).

1207991715840 is an abundant number, since it is smaller than the sum of its proper divisors (4470154940160).

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

1207991715840 is an equidigital number, since it uses as much as digits as its factorization.

1207991715840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The spelling of 1207991715840 in words is "one trillion, two hundred seven billion, nine hundred ninety-one million, seven hundred fifteen thousand, eight hundred forty".