161786820704 has 12 divisors (see below), whose sum is σ = 318517803324. Its totient is φ = 80893410336.

The previous prime is 161786820703. The next prime is 161786820721. The reversal of 161786820704 is 407028687161.

It is a happy number.

It is a super-3 number, since 3×161786820704³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161786820703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2527919042 + ... + 2527919105.

It is an arithmetic number, because the mean of its divisors is an integer number (26543150277).

Almost surely, 2^161786820704 is an apocalyptic number.

It is an amenable number.

161786820704 is a deficient number, since it is larger than the sum of its proper divisors (156730982620).

161786820704 is an equidigital number, since it uses as much as digits as its factorization.

161786820704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055838157 (or 5055838149 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 161786820704 in words is "one hundred sixty-one billion, seven hundred eighty-six million, eight hundred twenty thousand, seven hundred four".