161195973240 has 64 divisors (see below), whose sum is σ = 484175808000. Its totient is φ = 42933336192.

The previous prime is 161195973121. The next prime is 161195973269. The reversal of 161195973240 is 42379591161.

It is a self number, because there is not a number n which added to its sum of digits gives 161195973240.

It is a congruent number.

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, 717340 + ... + 914859.

It is an arithmetic number, because the mean of its divisors is an integer number (7565247000).

Almost surely, 2^161195973240 is an apocalyptic number.

161195973240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161195973240 is an abundant number, since it is smaller than the sum of its proper divisors (322979834760).

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

161195973240 is a wasteful number, since it uses less digits than its factorization.

161195973240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633036 (or 1633032 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 161195973240 in words is "one hundred sixty-one billion, one hundred ninety-five million, nine hundred seventy-three thousand, two hundred forty".