161980249872378 has 16 divisors (see below), whose sum is σ = 370240571136960. Its totient is φ = 46280071392096.

The previous prime is 161980249872377. The next prime is 161980249872403. The reversal of 161980249872378 is 873278942089161.

It is not an unprimeable number, because it can be changed into a prime (161980249872373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1928336307963 + ... + 1928336308046.

It is an arithmetic number, because the mean of its divisors is an integer number (23140035696060).

Almost surely, 2^{161980249872378} is an apocalyptic number.

161980249872378 is an abundant number, since it is smaller than the sum of its proper divisors (208260321264582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161980249872378 is a wasteful number, since it uses less digits than its factorization.

161980249872378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856672616021.

The product of its (nonzero) digits is 585252864, while the sum is 75.

The spelling of 161980249872378 in words is "one hundred sixty-one trillion, nine hundred eighty billion, two hundred forty-nine million, eight hundred seventy-two thousand, three hundred seventy-eight".