64900061 has 2 divisors, whose sum is σ = 64900062. Its totient is φ = 64900060.

The previous prime is 64900049. The next prime is 64900063. The reversal of 64900061 is 16000946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41036836 + 23863225 = 6406^2 + 4885^2 .

It is a cyclic number.

It is not a de Polignac number, because 64900061 - 2¹⁴ = 64883677 is a prime.

It is a Sophie Germain prime.

Together with 64900063, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_3835007 and since 64900061 and 3835007 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64900061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64900063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32450030 + 32450031.

It is an arithmetic number, because the mean of its divisors is an integer number (32450031).

Almost surely, 2^64900061 is an apocalyptic number.

It is an amenable number.

64900061 is a deficient number, since it is larger than the sum of its proper divisors (1).

64900061 is an equidigital number, since it uses as much as digits as its factorization.

64900061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 64900061 is about 8056.0574104211. The cubic root of 64900061 is about 401.8664048706.

The spelling of 64900061 in words is "sixty-four million, nine hundred thousand, sixty-one".