2667728521 has 4 divisors (see below), whose sum is σ = 2691336852. Its totient is φ = 2644120192.

The previous prime is 2667728491. The next prime is 2667728537. The reversal of 2667728521 is 1258277662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32035600 + 2635692921 = 5660^2 + 51339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2667728521 - 2¹⁵ = 2667695753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2667728321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11803996 + ... + 11804221.

It is an arithmetic number, because the mean of its divisors is an integer number (672834213).

Almost surely, 2^2667728521 is an apocalyptic number.

It is an amenable number.

2667728521 is a deficient number, since it is larger than the sum of its proper divisors (23608331).

2667728521 is a wasteful number, since it uses less digits than its factorization.

2667728521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23608330.

The product of its digits is 564480, while the sum is 46.

The square root of 2667728521 is about 51650.0582865112. The cubic root of 2667728521 is about 1386.9065864442.

The spelling of 2667728521 in words is "two billion, six hundred sixty-seven million, seven hundred twenty-eight thousand, five hundred twenty-one".