16020642464251 has 4 divisors (see below), whose sum is σ = 16049930659432. Its totient is φ = 15991354269072.

The previous prime is 16020642464221. The next prime is 16020642464269. The reversal of 16020642464251 is 15246424602061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16020642464251 - 2⁹ = 16020642463739 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16020642464198 and 16020642464207.

It is not an unprimeable number, because it can be changed into a prime (16020642464221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14644096770 + ... + 14644097863.

It is an arithmetic number, because the mean of its divisors is an integer number (4012482664858).

Almost surely, 2^{16020642464251} is an apocalyptic number.

16020642464251 is a deficient number, since it is larger than the sum of its proper divisors (29288195181).

16020642464251 is an equidigital number, since it uses as much as digits as its factorization.

16020642464251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29288195180.

The product of its (nonzero) digits is 552960, while the sum is 43.

The spelling of 16020642464251 in words is "sixteen trillion, twenty billion, six hundred forty-two million, four hundred sixty-four thousand, two hundred fifty-one".