161303605204040 has 64 divisors (see below), whose sum is σ = 390964108494960. Its totient is φ = 59541025259520.

The previous prime is 161303605203989. The next prime is 161303605204081. The reversal of 161303605204040 is 40402506303161.

It can be written as a sum of positive squares in 8 ways, for example, as 2396050134724 + 158907555069316 = 1547918^2 + 12605854^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43067741 + ... + 46663020.

Almost surely, 2^{161303605204040} is an apocalyptic number.

161303605204040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161303605204040 is an abundant number, since it is smaller than the sum of its proper divisors (229660503290920).

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

161303605204040 is a wasteful number, since it uses less digits than its factorization.

161303605204040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89734242 (or 89734238 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 161303605204040 in words is "one hundred sixty-one trillion, three hundred three billion, six hundred five million, two hundred four thousand, forty".