16475796479621 has 2 divisors, whose sum is σ = 16475796479622. Its totient is φ = 16475796479620.

The previous prime is 16475796479567. The next prime is 16475796479663. The reversal of 16475796479621 is 12697469757461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12347528349025 + 4128268130596 = 3513905^2 + 2031814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16475796479621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16475796479321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8237898239810 + 8237898239811.

It is an arithmetic number, because the mean of its divisors is an integer number (8237898239811).

Almost surely, 2^{16475796479621} is an apocalyptic number.

It is an amenable number.

16475796479621 is a deficient number, since it is larger than the sum of its proper divisors (1).

16475796479621 is an equidigital number, since it uses as much as digits as its factorization.

16475796479621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960180480, while the sum is 74.

The spelling of 16475796479621 in words is "sixteen trillion, four hundred seventy-five billion, seven hundred ninety-six million, four hundred seventy-nine thousand, six hundred twenty-one".