64155969 has 10 divisors (see below), whose sum is σ = 95838050. Its totient is φ = 42770592.

The previous prime is 64155937. The next prime is 64155991. The reversal of 64155969 is 96955146.

It is a happy number.

64155969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 59490369 + 4665600 = 7713^2 + 2160^2 .

It is not a de Polignac number, because 64155969 - 2⁵ = 64155937 is a prime.

It is a super-2 number, since 2×64155969² = 8231976716657922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64154969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 395944 + ... + 396105.

It is an arithmetic number, because the mean of its divisors is an integer number (9583805).

Almost surely, 2^64155969 is an apocalyptic number.

It is an amenable number.

64155969 is a deficient number, since it is larger than the sum of its proper divisors (31682081).

64155969 is an equidigital number, since it uses as much as digits as its factorization.

64155969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792061 (or 792052 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 64155969 is about 8009.7421306806. The cubic root of 64155969 is about 400.3246718159.

The spelling of 64155969 in words is "sixty-four million, one hundred fifty-five thousand, nine hundred sixty-nine".