161455003421 has 16 divisors (see below), whose sum is σ = 170537451840. Its totient is φ = 152431868160.

The previous prime is 161455003399. The next prime is 161455003429. The reversal of 161455003421 is 124300554161.

It is a cyclic number.

It is not a de Polignac number, because 161455003421 - 2⁶ = 161455003357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161455003429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7404491 + ... + 7426263.

It is an arithmetic number, because the mean of its divisors is an integer number (10658590740).

Almost surely, 2^161455003421 is an apocalyptic number.

It is an amenable number.

161455003421 is a deficient number, since it is larger than the sum of its proper divisors (9082448419).

161455003421 is a wasteful number, since it uses less digits than its factorization.

161455003421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23116.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 161455003421 its reverse (124300554161), we get a palindrome (285755557582).

The spelling of 161455003421 in words is "one hundred sixty-one billion, four hundred fifty-five million, three thousand, four hundred twenty-one".