161401143940 has 12 divisors (see below), whose sum is σ = 338942402316. Its totient is φ = 64560457568.

The previous prime is 161401143913. The next prime is 161401143949. The reversal of 161401143940 is 49341104161.

It can be written as a sum of positive squares in 2 ways, for example, as 69281609796 + 92119534144 = 263214^2 + 303512^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161401143896 and 161401143905.

It is not an unprimeable number, because it can be changed into a prime (161401143949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4035028579 + ... + 4035028618.

It is an arithmetic number, because the mean of its divisors is an integer number (28245200193).

Almost surely, 2^161401143940 is an apocalyptic number.

161401143940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161401143940 is an abundant number, since it is smaller than the sum of its proper divisors (177541258376).

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

161401143940 is a wasteful number, since it uses less digits than its factorization.

161401143940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8070057206 (or 8070057204 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 161401143940 in words is "one hundred sixty-one billion, four hundred one million, one hundred forty-three thousand, nine hundred forty".