1970642173666 has 4 divisors (see below), whose sum is σ = 2955963260502. Its totient is φ = 985321086832.

The previous prime is 1970642173553. The next prime is 1970642173769. The reversal of 1970642173666 is 6663712460791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1835821755625 + 134820418041 = 1354925^2 + 367179^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1970642173666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492660543415 + ... + 492660543418.

Almost surely, 2^{1970642173666} is an apocalyptic number.

1970642173666 is a deficient number, since it is larger than the sum of its proper divisors (985321086836).

1970642173666 is an equidigital number, since it uses as much as digits as its factorization.

1970642173666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985321086835.

The product of its (nonzero) digits is 13716864, while the sum is 58.

The spelling of 1970642173666 in words is "one trillion, nine hundred seventy billion, six hundred forty-two million, one hundred seventy-three thousand, six hundred sixty-six".