64206531631478 has 4 divisors (see below), whose sum is σ = 96309797447220. Its totient is φ = 32103265815738.

The previous prime is 64206531631453. The next prime is 64206531631493. The reversal of 64206531631478 is 87413613560246.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16051632907868 + ... + 16051632907871.

It is an arithmetic number, because the mean of its divisors is an integer number (24077449361805).

Almost surely, 2^{64206531631478} is an apocalyptic number.

64206531631478 is a deficient number, since it is larger than the sum of its proper divisors (32103265815742).

64206531631478 is a wasteful number, since it uses less digits than its factorization.

64206531631478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32103265815741.

The product of its (nonzero) digits is 17418240, while the sum is 56.

The spelling of 64206531631478 in words is "sixty-four trillion, two hundred six billion, five hundred thirty-one million, six hundred thirty-one thousand, four hundred seventy-eight".