1147778972520 has 128 divisors (see below), whose sum is σ = 3498806102400. Its totient is φ = 301182787584.

The previous prime is 1147778972443. The next prime is 1147778972531. The reversal of 1147778972520 is 252798777411.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1580364 + ... + 2189316.

It is an arithmetic number, because the mean of its divisors is an integer number (27334422675).

Almost surely, 2^{1147778972520} is an apocalyptic number.

1147778972520 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 1147778972520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1749403051200).

1147778972520 is an abundant number, since it is smaller than the sum of its proper divisors (2351027129880).

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

1147778972520 is a wasteful number, since it uses less digits than its factorization.

1147778972520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609219 (or 609215 counting only the distinct ones).

The product of its (nonzero) digits is 13829760, while the sum is 60.

The spelling of 1147778972520 in words is "one trillion, one hundred forty-seven billion, seven hundred seventy-eight million, nine hundred seventy-two thousand, five hundred twenty".