65650639 has 2 divisors, whose sum is σ = 65650640. Its totient is φ = 65650638.

The previous prime is 65650631. The next prime is 65650703. The reversal of 65650639 is 93605656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65650639 - 2³ = 65650631 is a prime.

It is a super-2 number, since 2×65650639² = 8620012802216642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65650631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32825319 + 32825320.

It is an arithmetic number, because the mean of its divisors is an integer number (32825320).

Almost surely, 2^65650639 is an apocalyptic number.

65650639 is a deficient number, since it is larger than the sum of its proper divisors (1).

65650639 is an equidigital number, since it uses as much as digits as its factorization.

65650639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 40.

The square root of 65650639 is about 8102.5081919119. The cubic root of 65650639 is about 403.4096838059.

The spelling of 65650639 in words is "sixty-five million, six hundred fifty thousand, six hundred thirty-nine".