65406649 has 16 divisors (see below), whose sum is σ = 82304640. Its totient is φ = 50492160.

The previous prime is 65406637. The next prime is 65406659. The reversal of 65406649 is 94660456.

It is a cyclic number.

It is not a de Polignac number, because 65406649 - 2⁵ = 65406617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65406659) 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, 4497 + ... + 12289.

It is an arithmetic number, because the mean of its divisors is an integer number (5144040).

Almost surely, 2^65406649 is an apocalyptic number.

It is an amenable number.

65406649 is a deficient number, since it is larger than the sum of its proper divisors (16897991).

65406649 is a wasteful number, since it uses less digits than its factorization.

65406649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7920.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 65406649 is about 8087.4377277355. The cubic root of 65406649 is about 402.9093072767.

The spelling of 65406649 in words is "sixty-five million, four hundred six thousand, six hundred forty-nine".