1649542367221 has 8 divisors (see below), whose sum is σ = 1885672592640. Its totient is φ = 1413532470768.

The previous prime is 1649542367219. The next prime is 1649542367237. The reversal of 1649542367221 is 1227632459461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1649542367221 - 2¹ = 1649542367219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649542367321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30052861 + ... + 30107698.

It is an arithmetic number, because the mean of its divisors is an integer number (235709074080).

Almost surely, 2^{1649542367221} is an apocalyptic number.

It is an amenable number.

1649542367221 is a deficient number, since it is larger than the sum of its proper divisors (236130225419).

1649542367221 is an equidigital number, since it uses as much as digits as its factorization.

1649542367221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60164483.

The product of its digits is 4354560, while the sum is 52.

The spelling of 1649542367221 in words is "one trillion, six hundred forty-nine billion, five hundred forty-two million, three hundred sixty-seven thousand, two hundred twenty-one".