648154778771 has 4 divisors (see below), whose sum is σ = 682268188200. Its totient is φ = 614041369344.

The previous prime is 648154778731. The next prime is 648154778773. The reversal of 648154778771 is 177877451846.

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

It is a cyclic number.

It is not a de Polignac number, because 648154778771 - 2²⁶ = 648087669907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 648154778698 and 648154778707.

It is not an unprimeable number, because it can be changed into a prime (648154778773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17056704686 + ... + 17056704723.

It is an arithmetic number, because the mean of its divisors is an integer number (170567047050).

Almost surely, 2^648154778771 is an apocalyptic number.

648154778771 is a deficient number, since it is larger than the sum of its proper divisors (34113409429).

648154778771 is a wasteful number, since it uses less digits than its factorization.

648154778771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34113409428.

The product of its digits is 73758720, while the sum is 65.

The spelling of 648154778771 in words is "six hundred forty-eight billion, one hundred fifty-four million, seven hundred seventy-eight thousand, seven hundred seventy-one".