6428837661 has 8 divisors (see below), whose sum is σ = 8580896544. Its totient is φ = 4281335280.

The previous prime is 6428837651. The next prime is 6428837677. The reversal of 6428837661 is 1667388246.

6428837661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6428837661 - 2¹¹ = 6428835613 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6428837621) 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, 1135831 + ... + 1141476.

It is an arithmetic number, because the mean of its divisors is an integer number (1072612068).

Almost surely, 2^6428837661 is an apocalyptic number.

It is an amenable number.

6428837661 is a deficient number, since it is larger than the sum of its proper divisors (2152058883).

6428837661 is a wasteful number, since it uses less digits than its factorization.

6428837661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278251.

The product of its digits is 2322432, while the sum is 51.

The square root of 6428837661 is about 80180.0328074266. The cubic root of 6428837661 is about 1859.4199506459.

The spelling of 6428837661 in words is "six billion, four hundred twenty-eight million, eight hundred thirty-seven thousand, six hundred sixty-one".