161232511440 has 320 divisors, whose sum is σ = 671089047552. Its totient is φ = 30925670400.

The previous prime is 161232511423. The next prime is 161232511463. The reversal of 161232511440 is 44115232161.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 161232511398 and 161232511407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 95326 + ... + 575805.

Almost surely, 2^161232511440 is an apocalyptic number.

161232511440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161232511440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335544523776).

161232511440 is an abundant number, since it is smaller than the sum of its proper divisors (509856536112).

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

161232511440 is a wasteful number, since it uses less digits than its factorization.

161232511440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671178 (or 671172 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 161232511440 in words is "one hundred sixty-one billion, two hundred thirty-two million, five hundred eleven thousand, four hundred forty".