161793402551 has 8 divisors (see below), whose sum is σ = 176550870144. Its totient is φ = 147044097720.

The previous prime is 161793402497. The next prime is 161793402559. The reversal of 161793402551 is 155204397161.

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 161793402551 - 2¹⁰ = 161793401527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161793402559) 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, 1999205 + ... + 2078558.

It is an arithmetic number, because the mean of its divisors is an integer number (22068858768).

Almost surely, 2^161793402551 is an apocalyptic number.

161793402551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161793402551 is a deficient number, since it is larger than the sum of its proper divisors (14757467593).

161793402551 is a wasteful number, since it uses less digits than its factorization.

161793402551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4081381.

The product of its (nonzero) digits is 226800, while the sum is 44.

The spelling of 161793402551 in words is "one hundred sixty-one billion, seven hundred ninety-three million, four hundred two thousand, five hundred fifty-one".