1491738512780 has 24 divisors (see below), whose sum is σ = 3140541701808. Its totient is φ = 595192390848.

The previous prime is 1491738512767. The next prime is 1491738512791. The reversal of 1491738512780 is 872158371941.

It is a super-2 number, since 2×1491738512780² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93930254 + ... + 93946133.

It is an arithmetic number, because the mean of its divisors is an integer number (130855904242).

Almost surely, 2^{1491738512780} is an apocalyptic number.

1491738512780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1491738512780 is an abundant number, since it is smaller than the sum of its proper divisors (1648803189028).

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

1491738512780 is a wasteful number, since it uses less digits than its factorization.

1491738512780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187876793 (or 187876791 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 56.

The spelling of 1491738512780 in words is "one trillion, four hundred ninety-one billion, seven hundred thirty-eight million, five hundred twelve thousand, seven hundred eighty".