65616623 has 2 divisors, whose sum is σ = 65616624. Its totient is φ = 65616622.

The previous prime is 65616619. The next prime is 65616637. The reversal of 65616623 is 32661656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65616623 - 2² = 65616619 is a prime.

It is a super-4 number, since 4×65616623⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65616643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32808311 + 32808312.

It is an arithmetic number, because the mean of its divisors is an integer number (32808312).

Almost surely, 2^65616623 is an apocalyptic number.

65616623 is a deficient number, since it is larger than the sum of its proper divisors (1).

65616623 is an equidigital number, since it uses as much as digits as its factorization.

65616623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 65616623 is about 8100.4088168438. The cubic root of 65616623 is about 403.3399979926.

The spelling of 65616623 in words is "sixty-five million, six hundred sixteen thousand, six hundred twenty-three".