5661021216 has 96 divisors (see below), whose sum is σ = 15772615488. Its totient is φ = 1771683840.

The previous prime is 5661021161. The next prime is 5661021227. The reversal of 5661021216 is 6121201665.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×5661021216² = 64094322416004237312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702651 + ... + 710661.

It is an arithmetic number, because the mean of its divisors is an integer number (164298078).

Almost surely, 2^5661021216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5661021216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7886307744).

5661021216 is an abundant number, since it is smaller than the sum of its proper divisors (10111594272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5661021216 is a wasteful number, since it uses less digits than its factorization.

5661021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8474 (or 8466 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 5661021216 is about 75239.7582133276. The cubic root of 5661021216 is about 1782.2348329676.

The spelling of 5661021216 in words is "five billion, six hundred sixty-one million, twenty-one thousand, two hundred sixteen".