65694109 has 16 divisors (see below), whose sum is σ = 73221120. Its totient is φ = 58556160.

The previous prime is 65694091. The next prime is 65694113. The reversal of 65694109 is 90149656.

It is not a de Polignac number, because 65694109 - 2¹⁵ = 65661341 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65694119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47589 + ... + 48949.

It is an arithmetic number, because the mean of its divisors is an integer number (4576320).

Almost surely, 2^65694109 is an apocalyptic number.

It is an amenable number.

65694109 is a deficient number, since it is larger than the sum of its proper divisors (7527011).

65694109 is a wasteful number, since it uses less digits than its factorization.

65694109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 65694109 is about 8105.1902506974. The cubic root of 65694109 is about 403.4987022331.

The spelling of 65694109 in words is "sixty-five million, six hundred ninety-four thousand, one hundred nine".