161782357451 has 8 divisors (see below), whose sum is σ = 190065986544. Its totient is φ = 135761418720.

The previous prime is 161782357447. The next prime is 161782357453. The reversal of 161782357451 is 154753287161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161782357451 - 2² = 161782357447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161782357451.

It is not an unprimeable number, because it can be changed into a prime (161782357453) 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, 565672436 + ... + 565672721.

It is an arithmetic number, because the mean of its divisors is an integer number (23758248318).

Almost surely, 2^161782357451 is an apocalyptic number.

161782357451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161782357451 is a deficient number, since it is larger than the sum of its proper divisors (28283629093).

161782357451 is a wasteful number, since it uses less digits than its factorization.

161782357451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131345181.

The product of its digits is 1411200, while the sum is 50.

The spelling of 161782357451 in words is "one hundred sixty-one billion, seven hundred eighty-two million, three hundred fifty-seven thousand, four hundred fifty-one".