61655623 has 2 divisors, whose sum is σ = 61655624. Its totient is φ = 61655622.

The previous prime is 61655603. The next prime is 61655639. The reversal of 61655623 is 32655616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61655623 - 2⁵ = 61655591 is a prime.

It is equal to p_3654385 and since 61655623 and 3654385 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 (61655603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30827811 + 30827812.

It is an arithmetic number, because the mean of its divisors is an integer number (30827812).

Almost surely, 2^61655623 is an apocalyptic number.

61655623 is a deficient number, since it is larger than the sum of its proper divisors (1).

61655623 is an equidigital number, since it uses as much as digits as its factorization.

61655623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 34.

The square root of 61655623 is about 7852.1094617943. The cubic root of 61655623 is about 395.0550006198.

The spelling of 61655623 in words is "sixty-one million, six hundred fifty-five thousand, six hundred twenty-three".