61397663 has 2 divisors, whose sum is σ = 61397664. Its totient is φ = 61397662.

The previous prime is 61397647. The next prime is 61397671. The reversal of 61397663 is 36679316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61397663 - 2⁴ = 61397647 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61397663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61396663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30698831 + 30698832.

It is an arithmetic number, because the mean of its divisors is an integer number (30698832).

Almost surely, 2^61397663 is an apocalyptic number.

61397663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61397663 is an equidigital number, since it uses as much as digits as its factorization.

61397663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 41.

The square root of 61397663 is about 7835.6660852795. Note that the first 3 decimals coincide. The cubic root of 61397663 is about 394.5032756320.

The spelling of 61397663 in words is "sixty-one million, three hundred ninety-seven thousand, six hundred sixty-three".