678549079007 has 4 divisors (see below), whose sum is σ = 678590624760. Its totient is φ = 678507533256.

The previous prime is 678549079003. The next prime is 678549079049. The reversal of 678549079007 is 700970945876.

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 678549079007 - 2² = 678549079003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678549079001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20748368 + ... + 20781045.

It is an arithmetic number, because the mean of its divisors is an integer number (169647656190).

Almost surely, 2^678549079007 is an apocalyptic number.

678549079007 is a deficient number, since it is larger than the sum of its proper divisors (41545753).

678549079007 is a wasteful number, since it uses less digits than its factorization.

678549079007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41545752.

The product of its (nonzero) digits is 26671680, while the sum is 62.

The spelling of 678549079007 in words is "six hundred seventy-eight billion, five hundred forty-nine million, seventy-nine thousand, seven".