1247978695488 has 224 divisors, whose sum is σ = 3878334501888. Its totient is φ = 346730803200.

The previous prime is 1247978695487. The next prime is 1247978695499. The reversal of 1247978695488 is 8845968797421.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247978695487) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16880043 + ... + 16953813.

It is an arithmetic number, because the mean of its divisors is an integer number (17313993312).

Almost surely, 2^{1247978695488} 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 1247978695488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1939167250944).

1247978695488 is an abundant number, since it is smaller than the sum of its proper divisors (2630355806400).

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

1247978695488 is a wasteful number, since it uses less digits than its factorization.

1247978695488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74141 (or 74131 counting only the distinct ones).

The product of its digits is 1950842880, while the sum is 78.

The spelling of 1247978695488 in words is "one trillion, two hundred forty-seven billion, nine hundred seventy-eight million, six hundred ninety-five thousand, four hundred eighty-eight".