64555771061 has 16 divisors (see below), whose sum is σ = 66171920640. Its totient is φ = 62962099200.

The previous prime is 64555771013. The next prime is 64555771087. The reversal of 64555771061 is 16017755546.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64555771061 - 2⁶ = 64555770997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64555770997 and 64555771015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64555779061) 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, 4183961 + ... + 4199361.

It is an arithmetic number, because the mean of its divisors is an integer number (4135745040).

Almost surely, 2^64555771061 is an apocalyptic number.

It is an amenable number.

64555771061 is a deficient number, since it is larger than the sum of its proper divisors (1616149579).

64555771061 is a wasteful number, since it uses less digits than its factorization.

64555771061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16124.

The product of its (nonzero) digits is 882000, while the sum is 47.

The spelling of 64555771061 in words is "sixty-four billion, five hundred fifty-five million, seven hundred seventy-one thousand, sixty-one".