166785776402 has 32 divisors (see below), whose sum is σ = 302883876480. Its totient is φ = 67286194560.

The previous prime is 166785776393. The next prime is 166785776407. The reversal of 166785776402 is 204677587661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (166785776407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1955099 + ... + 2038622.

It is an arithmetic number, because the mean of its divisors is an integer number (9465121140).

Almost surely, 2^166785776402 is an apocalyptic number.

166785776402 is a deficient number, since it is larger than the sum of its proper divisors (136098100078).

166785776402 is a wasteful number, since it uses less digits than its factorization.

166785776402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993906.

The product of its (nonzero) digits is 23708160, while the sum is 59.

The spelling of 166785776402 in words is "one hundred sixty-six billion, seven hundred eighty-five million, seven hundred seventy-six thousand, four hundred two".