5404351661 has 8 divisors (see below), whose sum is σ = 5414188824. Its totient is φ = 5394525760.

The previous prime is 5404351657. The next prime is 5404351691. The reversal of 5404351661 is 1661534045.

It can be written as a sum of positive squares in 4 ways, for example, as 830534761 + 4573816900 = 28819^2 + 67630^2 .

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 5404351661 - 2² = 5404351657 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 (5404351691) 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, 1903535 + ... + 1906371.

It is an arithmetic number, because the mean of its divisors is an integer number (676773603).

Almost surely, 2^5404351661 is an apocalyptic number.

It is an amenable number.

5404351661 is a deficient number, since it is larger than the sum of its proper divisors (9837163).

5404351661 is a wasteful number, since it uses less digits than its factorization.

5404351661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 5404351661 is about 73514.2956233684. The cubic root of 5404351661 is about 1754.8817880188.

The spelling of 5404351661 in words is "five billion, four hundred four million, three hundred fifty-one thousand, six hundred sixty-one".