1491263288400 has 120 divisors (see below), whose sum is σ = 4906122016864. Its totient is φ = 386922355200.

The previous prime is 1491263288369. The next prime is 1491263288401. The reversal of 1491263288400 is 48823621941.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

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 1491263288400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491263288401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16749106 + ... + 16837905.

Almost surely, 2^{1491263288400} is an apocalyptic number.

1491263288400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1491263288400 is an abundant number, since it is smaller than the sum of its proper divisors (3414858728464).

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

1491263288400 is a wasteful number, since it uses less digits than its factorization.

1491263288400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33587069 (or 33587058 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The spelling of 1491263288400 in words is "one trillion, four hundred ninety-one billion, two hundred sixty-three million, two hundred eighty-eight thousand, four hundred".