6408407661 has 8 divisors (see below), whose sum is σ = 8689366560. Its totient is φ = 4199860272.

The previous prime is 6408407633. The next prime is 6408407689. The reversal of 6408407661 is 1667048046.

It is an interprime number because it is at equal distance from previous prime (6408407633) and next prime (6408407689).

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

It is not a de Polignac number, because 6408407661 - 2⁶ = 6408407597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6408407861) 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, 18102670 + ... + 18103023.

It is an arithmetic number, because the mean of its divisors is an integer number (1086170820).

Almost surely, 2^6408407661 is an apocalyptic number.

It is an amenable number.

6408407661 is a deficient number, since it is larger than the sum of its proper divisors (2280958899).

6408407661 is a wasteful number, since it uses less digits than its factorization.

6408407661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36205755.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 6408407661 is about 80052.5306345777. The cubic root of 6408407661 is about 1857.4481965474.

The spelling of 6408407661 in words is "six billion, four hundred eight million, four hundred seven thousand, six hundred sixty-one".