64461655449 has 9 divisors (see below), whose sum is σ = 93112380309. Its totient is φ = 42973929180.

The previous prime is 64461655439. The next prime is 64461655469. The reversal of 64461655449 is 94455616446.

The square root of 64461655449 is 253893.

It is a perfect power (a square), and thus also a powerful number.

64461655449 is a `hidden beast` number, since 6 + 4 + 46 + 1 + 6 + 554 + 49 = 666.

64461655449 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 64461655449 - 2²⁹ = 63924784537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64461655395 and 64461655404.

It is not an unprimeable number, because it can be changed into a prime (64461655439) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 719364 + ... + 803994.

Almost surely, 2^64461655449 is an apocalyptic number.

64461655449 is the 253893-rd square number.

64461655449 is the 126947-th centered octagonal number.

It is an amenable number.

64461655449 is a deficient number, since it is larger than the sum of its proper divisors (28650724860).

64461655449 is an frugal number, since it uses more digits than its factorization.

64461655449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169268 (or 84634 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 54.

The spelling of 64461655449 in words is "sixty-four billion, four hundred sixty-one million, six hundred fifty-five thousand, four hundred forty-nine".