65619749 has 16 divisors (see below), whose sum is σ = 74928000. Its totient is φ = 56966976.

The previous prime is 65619739. The next prime is 65619751. The reversal of 65619749 is 94791656.

It is a cyclic number.

It is not a de Polignac number, because 65619749 - 2¹² = 65615653 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65619709) 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, 35912 + ... + 37694.

It is an arithmetic number, because the mean of its divisors is an integer number (4683000).

Almost surely, 2^65619749 is an apocalyptic number.

It is an amenable number.

65619749 is a deficient number, since it is larger than the sum of its proper divisors (9308251).

65619749 is a wasteful number, since it uses less digits than its factorization.

65619749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964.

The product of its digits is 408240, while the sum is 47.

The square root of 65619749 is about 8100.6017677701. The cubic root of 65619749 is about 403.3464029794.

The spelling of 65619749 in words is "sixty-five million, six hundred nineteen thousand, seven hundred forty-nine".