2664404642 has 4 divisors (see below), whose sum is σ = 3996606966. Its totient is φ = 1332202320.

The previous prime is 2664404623. The next prime is 2664404707. The reversal of 2664404642 is 2464044662.

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

It can be written as a sum of positive squares in only one way, i.e., 2042949601 + 621455041 = 45199^2 + 24929^2 .

It is a super-2 number, since 2×2664404642² = 14198104192622296328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2664404596 and 2664404605.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 666101159 + ... + 666101162.

Almost surely, 2^2664404642 is an apocalyptic number.

2664404642 is a deficient number, since it is larger than the sum of its proper divisors (1332202324).

2664404642 is a wasteful number, since it uses less digits than its factorization.

2664404642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332202323.

The product of its (nonzero) digits is 221184, while the sum is 38.

The square root of 2664404642 is about 51617.8713431695. The cubic root of 2664404642 is about 1386.3303377051.

The spelling of 2664404642 in words is "two billion, six hundred sixty-four million, four hundred four thousand, six hundred forty-two".