1643126292740 has 48 divisors (see below), whose sum is σ = 3465398991600. Its totient is φ = 654430425600.

The previous prime is 1643126292739. The next prime is 1643126292779. The reversal of 1643126292740 is 472926213461.

It can be written as a sum of positive squares in 8 ways, for example, as 18424261696 + 1624702031044 = 135736^2 + 1274638^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4725074 + ... + 5060886.

It is an arithmetic number, because the mean of its divisors is an integer number (72195812325).

Almost surely, 2^{1643126292740} is an apocalyptic number.

1643126292740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1643126292740 is an abundant number, since it is smaller than the sum of its proper divisors (1822272698860).

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

1643126292740 is a wasteful number, since it uses less digits than its factorization.

1643126292740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336872 (or 336870 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 1643126292740 in words is "one trillion, six hundred forty-three billion, one hundred twenty-six million, two hundred ninety-two thousand, seven hundred forty".