6411619921 has 16 divisors (see below), whose sum is σ = 7777088640. Its totient is φ = 5160072960.

The previous prime is 6411619883. The next prime is 6411619967. The reversal of 6411619921 is 1299161146.

It is not a de Polignac number, because 6411619921 - 2¹⁹ = 6411095633 is a prime.

It is a super-4 number, since 4×6411619921⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6411619021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13891 + ... + 114088.

It is an arithmetic number, because the mean of its divisors is an integer number (486068040).

Almost surely, 2^6411619921 is an apocalyptic number.

It is an amenable number.

6411619921 is a deficient number, since it is larger than the sum of its proper divisors (1365468719).

6411619921 is a wasteful number, since it uses less digits than its factorization.

6411619921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128424.

The product of its digits is 23328, while the sum is 40.

The square root of 6411619921 is about 80072.5915716483. The cubic root of 6411619921 is about 1857.7584977539.

The spelling of 6411619921 in words is "six billion, four hundred eleven million, six hundred nineteen thousand, nine hundred twenty-one".