666741413 has 4 divisors (see below), whose sum is σ = 718029228. Its totient is φ = 615453600.

The previous prime is 666741409. The next prime is 666741451. The reversal of 666741413 is 314147666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 448677124 + 218064289 = 21182^2 + 14767^2 .

It is a cyclic number.

It is not a de Polignac number, because 666741413 - 2² = 666741409 is a prime.

It is a super-2 number, since 2×666741413² = 889088223618473138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666741913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25643888 + ... + 25643913.

It is an arithmetic number, because the mean of its divisors is an integer number (179507307).

Almost surely, 2^666741413 is an apocalyptic number.

It is an amenable number.

666741413 is a deficient number, since it is larger than the sum of its proper divisors (51287815).

666741413 is a wasteful number, since it uses less digits than its factorization.

666741413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51287814.

The product of its digits is 72576, while the sum is 38.

The square root of 666741413 is about 25821.3363906673. The cubic root of 666741413 is about 873.6131119845.

The spelling of 666741413 in words is "six hundred sixty-six million, seven hundred forty-one thousand, four hundred thirteen".