2664521405 has 16 divisors (see below), whose sum is σ = 3935293824. Its totient is φ = 1686553920.

The previous prime is 2664521399. The next prime is 2664521413. The reversal of 2664521405 is 5041254662.

It is not a de Polignac number, because 2664521405 - 2⁸ = 2664521149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2927591 + ... + 2928500.

It is an arithmetic number, because the mean of its divisors is an integer number (245955864).

Almost surely, 2^2664521405 is an apocalyptic number.

It is an amenable number.

2664521405 is a deficient number, since it is larger than the sum of its proper divisors (1270772419).

2664521405 is a wasteful number, since it uses less digits than its factorization.

2664521405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856116.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 2664521405 is about 51619.0023634708. The cubic root of 2664521405 is about 1386.3505885987.

The spelling of 2664521405 in words is "two billion, six hundred sixty-four million, five hundred twenty-one thousand, four hundred five".