6421885961 has 8 divisors (see below), whose sum is σ = 6454154304. Its totient is φ = 6389692720.

The previous prime is 6421885957. The next prime is 6421885991. The reversal of 6421885961 is 1695881246.

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 6421885961 - 2² = 6421885957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421885901) 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, 156755 + ... + 193431.

It is an arithmetic number, because the mean of its divisors is an integer number (806769288).

Almost surely, 2^6421885961 is an apocalyptic number.

It is an amenable number.

6421885961 is a deficient number, since it is larger than the sum of its proper divisors (32268343).

6421885961 is a wasteful number, since it uses less digits than its factorization.

6421885961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37551.

The product of its digits is 829440, while the sum is 50.

The square root of 6421885961 is about 80136.6705135670. The cubic root of 6421885961 is about 1858.7494929212.

The spelling of 6421885961 in words is "six billion, four hundred twenty-one million, eight hundred eighty-five thousand, nine hundred sixty-one".