6461416921 has 2 divisors, whose sum is σ = 6461416922. Its totient is φ = 6461416920.

The previous prime is 6461416903. The next prime is 6461416961. The reversal of 6461416921 is 1296141646.

It is an a-pointer prime, because the next prime (6461416961) can be obtained adding 6461416921 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4880559321 + 1580857600 = 69861^2 + 39760^2 .

It is a cyclic number.

It is not a de Polignac number, because 6461416921 - 2²³ = 6453028313 is a prime.

It is not a weakly prime, because it can be changed into another prime (6461416901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3230708460 + 3230708461.

It is an arithmetic number, because the mean of its divisors is an integer number (3230708461).

Almost surely, 2^6461416921 is an apocalyptic number.

It is an amenable number.

6461416921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6461416921 is an equidigital number, since it uses as much as digits as its factorization.

6461416921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 6461416921 is about 80382.9392408613. The cubic root of 6461416921 is about 1862.5556383901. Note that the first 3 decimals are identical.

The spelling of 6461416921 in words is "six billion, four hundred sixty-one million, four hundred sixteen thousand, nine hundred twenty-one".