16154535421 has 2 divisors, whose sum is σ = 16154535422. Its totient is φ = 16154535420.

The previous prime is 16154535403. The next prime is 16154535497. The reversal of 16154535421 is 12453545161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15732684900 + 421850521 = 125430^2 + 20539^2 .

It is a cyclic number.

It is not a de Polignac number, because 16154535421 - 2¹³ = 16154527229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16154535401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8077267710 + 8077267711.

It is an arithmetic number, because the mean of its divisors is an integer number (8077267711).

Almost surely, 2^16154535421 is an apocalyptic number.

It is an amenable number.

16154535421 is a deficient number, since it is larger than the sum of its proper divisors (1).

16154535421 is an equidigital number, since it uses as much as digits as its factorization.

16154535421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 37.

The spelling of 16154535421 in words is "sixteen billion, one hundred fifty-four million, five hundred thirty-five thousand, four hundred twenty-one".