61661723 has 2 divisors, whose sum is σ = 61661724. Its totient is φ = 61661722.

The previous prime is 61661683. The next prime is 61661731. The reversal of 61661723 is 32716616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61661723 - 2¹⁸ = 61399579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61661723.

It is not a weakly prime, because it can be changed into another prime (61661773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30830861 + 30830862.

It is an arithmetic number, because the mean of its divisors is an integer number (30830862).

Almost surely, 2^61661723 is an apocalyptic number.

61661723 is a deficient number, since it is larger than the sum of its proper divisors (1).

61661723 is an equidigital number, since it uses as much as digits as its factorization.

61661723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 61661723 is about 7852.4978828396. The cubic root of 61661723 is about 395.0680286613.

The spelling of 61661723 in words is "sixty-one million, six hundred sixty-one thousand, seven hundred twenty-three".