161262348778 has 16 divisors (see below), whose sum is σ = 247235072040. Its totient is φ = 78860257216.

The previous prime is 161262348661. The next prime is 161262348803. The reversal of 161262348778 is 877843262161.

It can be written as a sum of positive squares in 4 ways, for example, as 152805155409 + 8457193369 = 390903^2 + 91963^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2365993 + ... + 2433196.

Almost surely, 2^161262348778 is an apocalyptic number.

161262348778 is a deficient number, since it is larger than the sum of its proper divisors (85972723262).

161262348778 is a wasteful number, since it uses less digits than its factorization.

161262348778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799561.

The product of its digits is 5419008, while the sum is 55.

The spelling of 161262348778 in words is "one hundred sixty-one billion, two hundred sixty-two million, three hundred forty-eight thousand, seven hundred seventy-eight".