64555771031 has 4 divisors (see below), whose sum is σ = 64567021464. Its totient is φ = 64544520600.

The previous prime is 64555771013. The next prime is 64555771087. The reversal of 64555771031 is 13017755546.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64555771031 is a prime.

It is a super-2 number, since 2×64555771031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64555770031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5616605 + ... + 5628086.

It is an arithmetic number, because the mean of its divisors is an integer number (16141755366).

Almost surely, 2^64555771031 is an apocalyptic number.

64555771031 is a deficient number, since it is larger than the sum of its proper divisors (11250433).

64555771031 is a wasteful number, since it uses less digits than its factorization.

64555771031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11250432.

The product of its (nonzero) digits is 441000, while the sum is 44.

The spelling of 64555771031 in words is "sixty-four billion, five hundred fifty-five million, seven hundred seventy-one thousand, thirty-one".