161401813242 has 16 divisors (see below), whose sum is σ = 322823157600. Its totient is φ = 53797349232.

The previous prime is 161401813241. The next prime is 161401813319. The reversal of 161401813242 is 242318104161.

It is a super-3 number, since 3×161401813242³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161401813241) 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, 705253 + ... + 905640.

It is an arithmetic number, because the mean of its divisors is an integer number (20176447350).

Almost surely, 2^161401813242 is an apocalyptic number.

161401813242 is an abundant number, since it is smaller than the sum of its proper divisors (161421344358).

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

161401813242 is a wasteful number, since it uses less digits than its factorization.

161401813242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627597.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 161401813242 in words is "one hundred sixty-one billion, four hundred one million, eight hundred thirteen thousand, two hundred forty-two".