401666051 has 2 divisors, whose sum is σ = 401666052. Its totient is φ = 401666050.

The previous prime is 401666047. The next prime is 401666059. The reversal of 401666051 is 150666104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401666051 - 2² = 401666047 is a prime.

It is a super-2 number, since 2×401666051² = 322671233051869202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401666059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200833025 + 200833026.

It is an arithmetic number, because the mean of its divisors is an integer number (200833026).

Almost surely, 2^401666051 is an apocalyptic number.

401666051 is a deficient number, since it is larger than the sum of its proper divisors (1).

401666051 is an equidigital number, since it uses as much as digits as its factorization.

401666051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 401666051 is about 20041.6079943701. The cubic root of 401666051 is about 737.8278468072.

The spelling of 401666051 in words is "four hundred one million, six hundred sixty-six thousand, fifty-one".