2657979861 has 8 divisors (see below), whose sum is σ = 3619377024. Its totient is φ = 1734284640.

The previous prime is 2657979827. The next prime is 2657979923. The reversal of 2657979861 is 1689797562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2657979861 - 2¹¹ = 2657977813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2657979795 and 2657979804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2657979361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9425320 + ... + 9425601.

It is an arithmetic number, because the mean of its divisors is an integer number (452422128).

Almost surely, 2^2657979861 is an apocalyptic number.

It is an amenable number.

2657979861 is a deficient number, since it is larger than the sum of its proper divisors (961397163).

2657979861 is a wasteful number, since it uses less digits than its factorization.

2657979861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18850971.

The product of its digits is 11430720, while the sum is 60.

The square root of 2657979861 is about 51555.5997055606. The cubic root of 2657979861 is about 1385.2151370286.

The spelling of 2657979861 in words is "two billion, six hundred fifty-seven million, nine hundred seventy-nine thousand, eight hundred sixty-one".