2666578004 has 6 divisors (see below), whose sum is σ = 4666511514. Its totient is φ = 1333289000.

The previous prime is 2666577997. The next prime is 2666578051. The reversal of 2666578004 is 4008756662.

It can be written as a sum of positive squares in only one way, i.e., 1568318404 + 1098259600 = 39602^2 + 33140^2 .

It is a super-2 number, since 2×2666578004² = 14221276502833248032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333322247 + ... + 333322254.

It is an arithmetic number, because the mean of its divisors is an integer number (777751919).

Almost surely, 2^2666578004 is an apocalyptic number.

It is an amenable number.

2666578004 is a deficient number, since it is larger than the sum of its proper divisors (1999933510).

2666578004 is a wasteful number, since it uses less digits than its factorization.

2666578004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666644505 (or 666644503 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The square root of 2666578004 is about 51638.9194697178. The cubic root of 2666578004 is about 1386.7071797160.

The spelling of 2666578004 in words is "two billion, six hundred sixty-six million, five hundred seventy-eight thousand, four".