61646069 has 4 divisors (see below), whose sum is σ = 61714944. Its totient is φ = 61577196.

The previous prime is 61646059. The next prime is 61646077. The reversal of 61646069 is 96064616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61646069 - 2¹² = 61641973 is a prime.

It is a super-2 number, since 2×61646069² = 7600475646305522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61646059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33077 + ... + 34890.

It is an arithmetic number, because the mean of its divisors is an integer number (15428736).

Almost surely, 2^61646069 is an apocalyptic number.

It is an amenable number.

61646069 is a deficient number, since it is larger than the sum of its proper divisors (68875).

61646069 is an equidigital number, since it uses as much as digits as its factorization.

61646069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68874.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 61646069 is about 7851.5010666751. The cubic root of 61646069 is about 395.0345939899.

The spelling of 61646069 in words is "sixty-one million, six hundred forty-six thousand, sixty-nine".