64407765461 has 8 divisors (see below), whose sum is σ = 70312377240. Its totient is φ = 58638892032.

The previous prime is 64407765451. The next prime is 64407765491. The reversal of 64407765461 is 16456770446.

It is a happy number.

64407765461 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 4 ways, for example, as 8991780625 + 55415984836 = 94825^2 + 235406^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64407765461 - 2⁶ = 64407765397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64407765451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33933596 + ... + 33935493.

It is an arithmetic number, because the mean of its divisors is an integer number (8789047155).

Almost surely, 2^64407765461 is an apocalyptic number.

It is an amenable number.

64407765461 is a deficient number, since it is larger than the sum of its proper divisors (5904611779).

64407765461 is a wasteful number, since it uses less digits than its factorization.

64407765461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67869175.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 64407765461 in words is "sixty-four billion, four hundred seven million, seven hundred sixty-five thousand, four hundred sixty-one".