64660855461 has 16 divisors (see below), whose sum is σ = 96090436800. Its totient is φ = 38436173568.

The previous prime is 64660855387. The next prime is 64660855471. The reversal of 64660855461 is 16455806646.

It is a happy number.

64660855461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64660855461 - 2⁹ = 64660854949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64660855471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33363766 + ... + 33365703.

It is an arithmetic number, because the mean of its divisors is an integer number (6005652300).

Almost surely, 2^64660855461 is an apocalyptic number.

It is an amenable number.

64660855461 is a deficient number, since it is larger than the sum of its proper divisors (31429581339).

64660855461 is a wasteful number, since it uses less digits than its factorization.

64660855461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66729508.

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 64660855461 in words is "sixty-four billion, six hundred sixty million, eight hundred fifty-five thousand, four hundred sixty-one".