166077901973 has 2 divisors, whose sum is σ = 166077901974. Its totient is φ = 166077901972.

The previous prime is 166077901939. The next prime is 166077902021. The reversal of 166077901973 is 379109770661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119894602564 + 46183299409 = 346258^2 + 214903^2 .

It is a cyclic number.

It is not a de Polignac number, because 166077901973 - 2²² = 166073707669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166077901573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83038950986 + 83038950987.

It is an arithmetic number, because the mean of its divisors is an integer number (83038950987).

Almost surely, 2^166077901973 is an apocalyptic number.

It is an amenable number.

166077901973 is a deficient number, since it is larger than the sum of its proper divisors (1).

166077901973 is an equidigital number, since it uses as much as digits as its factorization.

166077901973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000564, while the sum is 56.

The spelling of 166077901973 in words is "one hundred sixty-six billion, seventy-seven million, nine hundred one thousand, nine hundred seventy-three".