7921247551488 has 320 divisors, whose sum is σ = 24694717299120. Its totient is φ = 2525595697152.

The previous prime is 7921247551433. The next prime is 7921247551489. The reversal of 7921247551488 is 8841557421297.

7921247551488 is a `hidden beast` number, since 7 + 9 + 2 + 12 + 475 + 5 + 148 + 8 = 666.

It is a super-2 number, since 2×7921247551488² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7921247551489) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 60981906 + ... + 61111662.

Almost surely, 2^{7921247551488} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7921247551488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12347358649560).

7921247551488 is an abundant number, since it is smaller than the sum of its proper divisors (16773469747632).

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

7921247551488 is an equidigital number, since it uses as much as digits as its factorization.

7921247551488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129822 (or 129785 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 63.

The spelling of 7921247551488 in words is "seven trillion, nine hundred twenty-one billion, two hundred forty-seven million, five hundred fifty-one thousand, four hundred eighty-eight".