64448453690 has 16 divisors (see below), whose sum is σ = 117596357928. Its totient is φ = 25426238976.

The previous prime is 64448453603. The next prime is 64448453767. The reversal of 64448453690 is 9635484446.

64448453690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 253867²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 36583830361 + 27864623329 = 191269^2 + 166927^2 .

It is a super-2 number, since 2×64448453690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44142047 + ... + 44143506.

Almost surely, 2^64448453690 is an apocalyptic number.

64448453690 is a deficient number, since it is larger than the sum of its proper divisors (53147904238).

64448453690 is a wasteful number, since it uses less digits than its factorization.

64448453690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88285633.

The product of its (nonzero) digits is 9953280, while the sum is 53.

The spelling of 64448453690 in words is "sixty-four billion, four hundred forty-eight million, four hundred fifty-three thousand, six hundred ninety".