1643138599011 has 16 divisors (see below), whose sum is σ = 2696432573184. Its totient is φ = 866710469664.

The previous prime is 1643138599007. The next prime is 1643138599013. The reversal of 1643138599011 is 1109958313461.

It is not a de Polignac number, because 1643138599011 - 2² = 1643138599007 is a prime.

It is a super-3 number, since 3×1643138599011³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1643138599013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3009411081 + ... + 3009411626.

It is an arithmetic number, because the mean of its divisors is an integer number (168527035824).

Almost surely, 2^{1643138599011} is an apocalyptic number.

1643138599011 is a deficient number, since it is larger than the sum of its proper divisors (1053293974173).

1643138599011 is a wasteful number, since it uses less digits than its factorization.

1643138599011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6018822730.

The product of its (nonzero) digits is 699840, while the sum is 51.

The spelling of 1643138599011 in words is "one trillion, six hundred forty-three billion, one hundred thirty-eight million, five hundred ninety-nine thousand, eleven".