64474017021 has 6 divisors (see below), whose sum is σ = 93129135710. Its totient is φ = 42982678008.

The previous prime is 64474017007. The next prime is 64474017143. The reversal of 64474017021 is 12071047446.

It is a happy number.

64474017021 is a `hidden beast` number, since 6 + 447 + 40 + 170 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 57402888921 + 7071128100 = 239589^2 + 84090^2 .

It is not a de Polignac number, because 64474017021 - 2¹³ = 64474008829 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 (64474017001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3581889826 + ... + 3581889843.

Almost surely, 2^64474017021 is an apocalyptic number.

It is an amenable number.

64474017021 is a deficient number, since it is larger than the sum of its proper divisors (28655118689).

64474017021 is a wasteful number, since it uses less digits than its factorization.

64474017021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163779675 (or 7163779672 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The spelling of 64474017021 in words is "sixty-four billion, four hundred seventy-four million, seventeen thousand, twenty-one".