2157065210666 has 16 divisors (see below), whose sum is σ = 3381730430400. Its totient is φ = 1029973246368.

The previous prime is 2157065210653. The next prime is 2157065210771. The reversal of 2157065210666 is 6660125607512.

It is a self number, because there is not a number n which added to its sum of digits gives 2157065210666.

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, 37849331 + ... + 37906278.

It is an arithmetic number, because the mean of its divisors is an integer number (211358151900).

Almost surely, 2^{2157065210666} is an apocalyptic number.

2157065210666 is a deficient number, since it is larger than the sum of its proper divisors (1224665219734).

2157065210666 is a wasteful number, since it uses less digits than its factorization.

2157065210666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75756253.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 2157065210666 in words is "two trillion, one hundred fifty-seven billion, sixty-five million, two hundred ten thousand, six hundred sixty-six".