2658891649 has 8 divisors (see below), whose sum is σ = 2664829440. Its totient is φ = 2652962400.

The previous prime is 2658891617. The next prime is 2658891659. The reversal of 2658891649 is 9461988562.

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

It is a cyclic number.

It is not a de Polignac number, because 2658891649 - 2⁵ = 2658891617 is a prime.

It is a super-2 number, since 2×2658891649² = 14139409602243878402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2658891593 and 2658891602.

It is not an unprimeable number, because it can be changed into a prime (2658891659) 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, 1544109 + ... + 1545829.

It is an arithmetic number, because the mean of its divisors is an integer number (333103680).

Almost surely, 2^2658891649 is an apocalyptic number.

It is an amenable number.

2658891649 is a deficient number, since it is larger than the sum of its proper divisors (5937791).

2658891649 is a wasteful number, since it uses less digits than its factorization.

2658891649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271.

The product of its digits is 7464960, while the sum is 58.

The square root of 2658891649 is about 51564.4417113189. The cubic root of 2658891649 is about 1385.3735127139.

The spelling of 2658891649 in words is "two billion, six hundred fifty-eight million, eight hundred ninety-one thousand, six hundred forty-nine".