1491078541440 has 256 divisors, whose sum is σ = 4774292979840. Its totient is φ = 395828428800.

The previous prime is 1491078541391. The next prime is 1491078541471. The reversal of 1491078541440 is 441458701941.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1491078541440.

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, 430821310 + ... + 430824770.

Almost surely, 2^{1491078541440} is an apocalyptic number.

1491078541440 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 1491078541440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2387146489920).

1491078541440 is an abundant number, since it is smaller than the sum of its proper divisors (3283214438400).

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

1491078541440 is a wasteful number, since it uses less digits than its factorization.

1491078541440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4431 (or 4419 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 1491078541440 in words is "one trillion, four hundred ninety-one billion, seventy-eight million, five hundred forty-one thousand, four hundred forty".