1491122556336 has 640 divisors, whose sum is σ = 4958482636800. Its totient is φ = 376512675840.

The previous prime is 1491122556283. The next prime is 1491122556337. The reversal of 1491122556336 is 6336552211941.

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

It is not an unprimeable number, because it can be changed into a prime (1491122556337) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 772201291 + ... + 772203221.

It is an arithmetic number, because the mean of its divisors is an integer number (7747629120).

Almost surely, 2^{1491122556336} is an apocalyptic number.

1491122556336 is a gapful number since it is divisible by the number (16) 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 1491122556336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2479241318400).

1491122556336 is an abundant number, since it is smaller than the sum of its proper divisors (3467360080464).

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

1491122556336 is a wasteful number, since it uses less digits than its factorization.

1491122556336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2137 (or 2131 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 48.

The spelling of 1491122556336 in words is "one trillion, four hundred ninety-one billion, one hundred twenty-two million, five hundred fifty-six thousand, three hundred thirty-six".