4978676629921 has 4 divisors (see below), whose sum is σ = 4978709549892. Its totient is φ = 4978643709952.

The previous prime is 4978676629867. The next prime is 4978676629943. The reversal of 4978676629921 is 1299266768794.

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

It can be written as a sum of positive squares in 2 ways, for example, as 438747264400 + 4539929365521 = 662380^2 + 2130711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4978676629921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4978676629961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16232080 + ... + 16535953.

It is an arithmetic number, because the mean of its divisors is an integer number (1244677387473).

Almost surely, 2^{4978676629921} is an apocalyptic number.

It is an amenable number.

4978676629921 is a deficient number, since it is larger than the sum of its proper divisors (32919971).

4978676629921 is a wasteful number, since it uses less digits than its factorization.

4978676629921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32919970.

The product of its digits is 987614208, while the sum is 76.

The spelling of 4978676629921 in words is "four trillion, nine hundred seventy-eight billion, six hundred seventy-six million, six hundred twenty-nine thousand, nine hundred twenty-one".