1641996211216 has 45 divisors (see below), whose sum is σ = 3211915147581. Its totient is φ = 813189229632.

The previous prime is 1641996211211. The next prime is 1641996211231. The reversal of 1641996211216 is 6121126991461.

The square root of 1641996211216 is 1281404.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1144463481616 + 497532729600 = 1069796^2 + 705360^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641996211216.

It is not an unprimeable number, because it can be changed into a prime (1641996211211) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 558690675 + ... + 558693613.

Almost surely, 2^{1641996211216} is an apocalyptic number.

1641996211216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1641996211216 is the 1281404-th square number.

It is an amenable number.

1641996211216 is a deficient number, since it is larger than the sum of its proper divisors (1569918936365).

1641996211216 is an frugal number, since it uses more digits than its factorization.

1641996211216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104 (or 3050 counting only the distinct ones).

The product of its digits is 279936, while the sum is 49.

Multiplying 1641996211216 by its sum of digits (49), we get a square (80457814349584 = 8969828²).

The spelling of 1641996211216 in words is "one trillion, six hundred forty-one billion, nine hundred ninety-six million, two hundred eleven thousand, two hundred sixteen".