64506821042 has 4 divisors (see below), whose sum is σ = 96760231566. Its totient is φ = 32253410520.

The previous prime is 64506821023. The next prime is 64506821053. The reversal of 64506821042 is 24012860546.

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

It can be written as a sum of positive squares in only one way, i.e., 42312078601 + 22194742441 = 205699^2 + 148979^2 .

It is a super-2 number, since 2×64506821042² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64506820987 and 64506821005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16126705259 + ... + 16126705262.

Almost surely, 2^64506821042 is an apocalyptic number.

64506821042 is a deficient number, since it is larger than the sum of its proper divisors (32253410524).

64506821042 is a wasteful number, since it uses less digits than its factorization.

64506821042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32253410523.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 64506821042 in words is "sixty-four billion, five hundred six million, eight hundred twenty-one thousand, forty-two".