64969961 has 4 divisors (see below), whose sum is σ = 74251392. Its totient is φ = 55688532.

The previous prime is 64969951. The next prime is 64969969. The reversal of 64969961 is 16996946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16996946 = 2 ⋅8498473.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64969961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64969969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4640705 + ... + 4640718.

It is an arithmetic number, because the mean of its divisors is an integer number (18562848).

Almost surely, 2^64969961 is an apocalyptic number.

It is an amenable number.

64969961 is a deficient number, since it is larger than the sum of its proper divisors (9281431).

64969961 is an equidigital number, since it uses as much as digits as its factorization.

64969961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9281430.

The product of its digits is 629856, while the sum is 50.

The square root of 64969961 is about 8060.3945933186. The cubic root of 64969961 is about 402.0106285813.

The spelling of 64969961 in words is "sixty-four million, nine hundred sixty-nine thousand, nine hundred sixty-one".