2661957958690 has 16 divisors (see below), whose sum is σ = 4791703059000. Its totient is φ = 1064743464960.

The previous prime is 2661957958687. The next prime is 2661957958697. The reversal of 2661957958690 is 968597591662.

2661957958690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2464689624489 + 197268334201 = 1569933^2 + 444149^2 .

It is a super-2 number, since 2×2661957958690² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2661957958697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4682565 + ... + 5220184.

Almost surely, 2^{2661957958690} is an apocalyptic number.

2661957958690 is a deficient number, since it is larger than the sum of its proper divisors (2129745100310).

2661957958690 is a wasteful number, since it uses less digits than its factorization.

2661957958690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9929637.

The product of its (nonzero) digits is 440899200, while the sum is 73.

The spelling of 2661957958690 in words is "two trillion, six hundred sixty-one billion, nine hundred fifty-seven million, nine hundred fifty-eight thousand, six hundred ninety".