6154666421 has 2 divisors, whose sum is σ = 6154666422. Its totient is φ = 6154666420.

The previous prime is 6154666367. The next prime is 6154666457. The reversal of 6154666421 is 1246664516.

6154666421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3570062500 + 2584603921 = 59750^2 + 50839^2 .

It is a cyclic number.

It is not a de Polignac number, because 6154666421 - 2²² = 6150472117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6154666471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077333210 + 3077333211.

It is an arithmetic number, because the mean of its divisors is an integer number (3077333211).

Almost surely, 2^6154666421 is an apocalyptic number.

It is an amenable number.

6154666421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6154666421 is an equidigital number, since it uses as much as digits as its factorization.

6154666421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 41.

The square root of 6154666421 is about 78451.6820788439. The cubic root of 6154666421 is about 1832.6020715082.

The spelling of 6154666421 in words is "six billion, one hundred fifty-four million, six hundred sixty-six thousand, four hundred twenty-one".