61775647 has 2 divisors, whose sum is σ = 61775648. Its totient is φ = 61775646.

The previous prime is 61775639. The next prime is 61775657. The reversal of 61775647 is 74657716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61775647 - 2³ = 61775639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61775627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30887823 + 30887824.

It is an arithmetic number, because the mean of its divisors is an integer number (30887824).

Almost surely, 2^61775647 is an apocalyptic number.

61775647 is a deficient number, since it is larger than the sum of its proper divisors (1).

61775647 is an equidigital number, since it uses as much as digits as its factorization.

61775647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 43.

The square root of 61775647 is about 7859.7485328730. The cubic root of 61775647 is about 395.3111835073.

The spelling of 61775647 in words is "sixty-one million, seven hundred seventy-five thousand, six hundred forty-seven".