16351454621 has 2 divisors, whose sum is σ = 16351454622. Its totient is φ = 16351454620.

The previous prime is 16351454611. The next prime is 16351454657. The reversal of 16351454621 is 12645415361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13180188025 + 3171266596 = 114805^2 + 56314^2 .

It is a cyclic number.

It is not a de Polignac number, because 16351454621 - 2²⁶ = 16284345757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16351454611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8175727310 + 8175727311.

It is an arithmetic number, because the mean of its divisors is an integer number (8175727311).

Almost surely, 2^16351454621 is an apocalyptic number.

It is an amenable number.

16351454621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16351454621 is an equidigital number, since it uses as much as digits as its factorization.

16351454621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

Adding to 16351454621 its reverse (12645415361), we get a palindrome (28996869982).

The spelling of 16351454621 in words is "sixteen billion, three hundred fifty-one million, four hundred fifty-four thousand, six hundred twenty-one".