5661421549 has 16 divisors (see below), whose sum is σ = 7148659968. Its totient is φ = 4368621312.

The previous prime is 5661421547. The next prime is 5661421553. The reversal of 5661421549 is 9451241665.

It is a cyclic number.

It is not a de Polignac number, because 5661421549 - 2¹ = 5661421547 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 (5661421547) 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, 1031502 + ... + 1036975.

It is an arithmetic number, because the mean of its divisors is an integer number (446791248).

Almost surely, 2^5661421549 is an apocalyptic number.

It is an amenable number.

5661421549 is a deficient number, since it is larger than the sum of its proper divisors (1487238419).

5661421549 is a wasteful number, since it uses less digits than its factorization.

5661421549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2068524.

The product of its digits is 259200, while the sum is 43.

The square root of 5661421549 is about 75242.4185483162. The cubic root of 5661421549 is about 1782.2768436798.

The spelling of 5661421549 in words is "five billion, six hundred sixty-one million, four hundred twenty-one thousand, five hundred forty-nine".