2157771765066 has 16 divisors (see below), whose sum is σ = 4315597730784. Its totient is φ = 719248221584.

The previous prime is 2157771765047. The next prime is 2157771765073. The reversal of 2157771765066 is 6605671777512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731360 + ... + 2704283.

It is an arithmetic number, because the mean of its divisors is an integer number (269724858174).

Almost surely, 2^{2157771765066} is an apocalyptic number.

2157771765066 is an abundant number, since it is smaller than the sum of its proper divisors (2157825965718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2157771765066 is a wasteful number, since it uses less digits than its factorization.

2157771765066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516725.

The product of its (nonzero) digits is 25930800, while the sum is 60.

The spelling of 2157771765066 in words is "two trillion, one hundred fifty-seven billion, seven hundred seventy-one million, seven hundred sixty-five thousand, sixty-six".