1620971443911 has 16 divisors (see below), whose sum is σ = 2167144450560. Its totient is φ = 1077723420480.

The previous prime is 1620971443771. The next prime is 1620971443921. The reversal of 1620971443911 is 1193441790261.

It is not a de Polignac number, because 1620971443911 - 2¹¹ = 1620971441863 is a prime.

It is a super-3 number, since 3×1620971443911³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620971443921) 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, 20691826 + ... + 20770016.

It is an arithmetic number, because the mean of its divisors is an integer number (135446528160).

Almost surely, 2^{1620971443911} is an apocalyptic number.

1620971443911 is a deficient number, since it is larger than the sum of its proper divisors (546173006649).

1620971443911 is a wasteful number, since it uses less digits than its factorization.

1620971443911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96806.

The product of its (nonzero) digits is 326592, while the sum is 48.

The spelling of 1620971443911 in words is "one trillion, six hundred twenty billion, nine hundred seventy-one million, four hundred forty-three thousand, nine hundred eleven".