65016639 has 12 divisors (see below), whose sum is σ = 95045496. Its totient is φ = 42821712.

The previous prime is 65016583. The next prime is 65016661. The reversal of 65016639 is 93661056.

65016639 is a `hidden beast` number, since 6 + 5 + 0 + 16 + 639 = 666.

It is not a de Polignac number, because 65016639 - 2¹² = 65012543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65016139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42772 + ... + 44265.

It is an arithmetic number, because the mean of its divisors is an integer number (7920458).

Almost surely, 2^65016639 is an apocalyptic number.

65016639 is a deficient number, since it is larger than the sum of its proper divisors (30028857).

65016639 is a wasteful number, since it uses less digits than its factorization.

65016639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87126 (or 87123 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 65016639 is about 8063.2895892433. The cubic root of 65016639 is about 402.1068810631.

The spelling of 65016639 in words is "sixty-five million, sixteen thousand, six hundred thirty-nine".