61665007 has 2 divisors, whose sum is σ = 61665008. Its totient is φ = 61665006.

The previous prime is 61664959. The next prime is 61665011. The reversal of 61665007 is 70056616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61665007 - 2⁷ = 61664879 is a prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 61665007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61665017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30832503 + 30832504.

It is an arithmetic number, because the mean of its divisors is an integer number (30832504).

Almost surely, 2^61665007 is an apocalyptic number.

61665007 is a deficient number, since it is larger than the sum of its proper divisors (1).

61665007 is an equidigital number, since it uses as much as digits as its factorization.

61665007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 61665007 is about 7852.7069854923. The cubic root of 61665007 is about 395.0750420904.

The spelling of 61665007 in words is "sixty-one million, six hundred sixty-five thousand, seven".