64546460781 has 16 divisors (see below), whose sum is σ = 93904634880. Its totient is φ = 39111203120.

The previous prime is 64546460747. The next prime is 64546460813. The reversal of 64546460781 is 18706464546.

64546460781 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 64546460781 - 2¹⁹ = 64545936493 is a prime.

It is a super-2 number, since 2×64546460781² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64546460281) 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, 27795 + ... + 360368.

It is an arithmetic number, because the mean of its divisors is an integer number (5869039680).

Almost surely, 2^64546460781 is an apocalyptic number.

It is an amenable number.

64546460781 is a deficient number, since it is larger than the sum of its proper divisors (29358174099).

64546460781 is a wasteful number, since it uses less digits than its factorization.

64546460781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393216.

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 64546460781 in words is "sixty-four billion, five hundred forty-six million, four hundred sixty thousand, seven hundred eighty-one".