2664561658 has 16 divisors (see below), whose sum is σ = 4434095520. Its totient is φ = 1190635600.

The previous prime is 2664561617. The next prime is 2664561677. The reversal of 2664561658 is 8561654662.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1025113 + ... + 1027708.

It is an arithmetic number, because the mean of its divisors is an integer number (277130970).

Almost surely, 2^2664561658 is an apocalyptic number.

2664561658 is a deficient number, since it is larger than the sum of its proper divisors (1769533862).

2664561658 is a wasteful number, since it uses less digits than its factorization.

2664561658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052893.

The product of its digits is 2073600, while the sum is 49.

The square root of 2664561658 is about 51619.3922668603. The cubic root of 2664561658 is about 1386.3575697760.

The spelling of 2664561658 in words is "two billion, six hundred sixty-four million, five hundred sixty-one thousand, six hundred fifty-eight".