478881457646 has 4 divisors (see below), whose sum is σ = 718322186472. Its totient is φ = 239440728822.

The previous prime is 478881457633. The next prime is 478881457651. The reversal of 478881457646 is 646754188874.

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

It is a super-2 number, since 2×478881457646² (a number of 24 digits) contains 22 as substring.

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, 119720364410 + ... + 119720364413.

It is an arithmetic number, because the mean of its divisors is an integer number (179580546618).

Almost surely, 2^478881457646 is an apocalyptic number.

478881457646 is a deficient number, since it is larger than the sum of its proper divisors (239440728826).

478881457646 is a wasteful number, since it uses less digits than its factorization.

478881457646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239440728825.

The product of its digits is 289013760, while the sum is 68.

The spelling of 478881457646 in words is "four hundred seventy-eight billion, eight hundred eighty-one million, four hundred fifty-seven thousand, six hundred forty-six".