2640501655 has 8 divisors (see below), whose sum is σ = 3456656784. Its totient is φ = 1920364800.

The previous prime is 2640501653. The next prime is 2640501697. The reversal of 2640501655 is 5561050462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2640501655 - 2¹ = 2640501653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2640501655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640501653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24004506 + ... + 24004615.

It is an arithmetic number, because the mean of its divisors is an integer number (432082098).

Almost surely, 2^2640501655 is an apocalyptic number.

2640501655 is a deficient number, since it is larger than the sum of its proper divisors (816155129).

2640501655 is a wasteful number, since it uses less digits than its factorization.

2640501655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48009137.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 2640501655 is about 51385.8118063732. The cubic root of 2640501655 is about 1382.1721820833.

The spelling of 2640501655 in words is "two billion, six hundred forty million, five hundred one thousand, six hundred fifty-five".