2015640655 has 16 divisors (see below), whose sum is σ = 2803244544. Its totient is φ = 1362684960.

The previous prime is 2015640643. The next prime is 2015640667. The reversal of 2015640655 is 5560465102.

It is an interprime number because it is at equal distance from previous prime (2015640643) and next prime (2015640667).

It is not a de Polignac number, because 2015640655 - 2⁵ = 2015640623 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 2015640655.

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, 403077 + ... + 408046.

It is an arithmetic number, because the mean of its divisors is an integer number (175202784).

Almost surely, 2^2015640655 is an apocalyptic number.

2015640655 is a deficient number, since it is larger than the sum of its proper divisors (787603889).

2015640655 is an equidigital number, since it uses as much as digits as its factorization.

2015640655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811206.

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

The square root of 2015640655 is about 44895.8868383285. The cubic root of 2015640655 is about 1263.1968571268.

The spelling of 2015640655 in words is "two billion, fifteen million, six hundred forty thousand, six hundred fifty-five".