648478142991 has 12 divisors (see below), whose sum is σ = 1070503601232. Its totient is φ = 370558938816.

The previous prime is 648478142947. The next prime is 648478143013. The reversal of 648478142991 is 199241874846.

648478142991 is a `hidden beast` number, since 6 + 4 + 8 + 47 + 81 + 429 + 91 = 666.

It is not a de Polignac number, because 648478142991 - 2¹⁵ = 648478110223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 10293303857 = 648478142991 / (6 + 4 + 8 + 4 + 7 + 8 + 1 + 4 + 2 + 9 + 9 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648478142791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5146651866 + ... + 5146651991.

It is an arithmetic number, because the mean of its divisors is an integer number (89208633436).

Almost surely, 2^648478142991 is an apocalyptic number.

648478142991 is a deficient number, since it is larger than the sum of its proper divisors (422025458241).

648478142991 is a wasteful number, since it uses less digits than its factorization.

648478142991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293303870 (or 10293303867 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 63.

The spelling of 648478142991 in words is "six hundred forty-eight billion, four hundred seventy-eight million, one hundred forty-two thousand, nine hundred ninety-one".