665751461 has 2 divisors, whose sum is σ = 665751462. Its totient is φ = 665751460.

The previous prime is 665751419. The next prime is 665751473. The reversal of 665751461 is 164157566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 384552100 + 281199361 = 19610^2 + 16769^2 .

It is a cyclic number.

It is not a de Polignac number, because 665751461 - 2²² = 661557157 is a prime.

It is a super-3 number, since 3×665751461³ (a number of 27 digits) contains 333 as substring.

It is equal to p_34569473 and since 665751461 and 34569473 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665751761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332875730 + 332875731.

It is an arithmetic number, because the mean of its divisors is an integer number (332875731).

Almost surely, 2^665751461 is an apocalyptic number.

It is an amenable number.

665751461 is a deficient number, since it is larger than the sum of its proper divisors (1).

665751461 is an equidigital number, since it uses as much as digits as its factorization.

665751461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 41.

The square root of 665751461 is about 25802.1600064801. The cubic root of 665751461 is about 873.1805287728.

The spelling of 665751461 in words is "six hundred sixty-five million, seven hundred fifty-one thousand, four hundred sixty-one".