412666861 has 2 divisors, whose sum is σ = 412666862. Its totient is φ = 412666860.

The previous prime is 412666831. The next prime is 412666889. The reversal of 412666861 is 168666214.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 367910761 + 44756100 = 19181^2 + 6690^2 .

It is a cyclic number.

It is not a de Polignac number, because 412666861 - 2²⁵ = 379112429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (412666831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 206333430 + 206333431.

It is an arithmetic number, because the mean of its divisors is an integer number (206333431).

Almost surely, 2^412666861 is an apocalyptic number.

It is an amenable number.

412666861 is a deficient number, since it is larger than the sum of its proper divisors (1).

412666861 is an equidigital number, since it uses as much as digits as its factorization.

412666861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 412666861 is about 20314.2034301126. The cubic root of 412666861 is about 744.5031361109.

The spelling of 412666861 in words is "four hundred twelve million, six hundred sixty-six thousand, eight hundred sixty-one".