64612661 has 2 divisors, whose sum is σ = 64612662. Its totient is φ = 64612660.

The previous prime is 64612657. The next prime is 64612663. The reversal of 64612661 is 16621646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63600625 + 1012036 = 7975^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 64612661 - 2² = 64612657 is a prime.

It is a Sophie Germain prime.

Together with 64612663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64612663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32306330 + 32306331.

It is an arithmetic number, because the mean of its divisors is an integer number (32306331).

Almost surely, 2^64612661 is an apocalyptic number.

It is an amenable number.

64612661 is a deficient number, since it is larger than the sum of its proper divisors (1).

64612661 is an equidigital number, since it uses as much as digits as its factorization.

64612661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 64612661 is about 8038.2001094772. The cubic root of 64612661 is about 401.2723257603.

The spelling of 64612661 in words is "sixty-four million, six hundred twelve thousand, six hundred sixty-one".