1491399334656 has 1944 divisors, whose sum is σ = 5978384324640. Its totient is φ = 349479567360.

The previous prime is 1491399334643. The next prime is 1491399334657. The reversal of 1491399334656 is 6564339931941.

1491399334656 is a `hidden beast` number, since 1 + 4 + 9 + 139 + 9 + 33 + 465 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (56687040) is a multiple of the sum of its prime divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 1491399334593 and 1491399334602.

It is not an unprimeable number, because it can be changed into a prime (1491399334657) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 20430127836 + ... + 20430127908.

Almost surely, 2^{1491399334656} is an apocalyptic number.

1491399334656 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 1491399334656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2989192162320).

1491399334656 is an abundant number, since it is smaller than the sum of its proper divisors (4486984989984).

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

1491399334656 is a wasteful number, since it uses less digits than its factorization.

1491399334656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 144 counting only the distinct ones).

The product of its digits is 56687040, while the sum is 63.

The spelling of 1491399334656 in words is "one trillion, four hundred ninety-one billion, three hundred ninety-nine million, three hundred thirty-four thousand, six hundred fifty-six".