1642675725571 has 2 divisors, whose sum is σ = 1642675725572. Its totient is φ = 1642675725570.

The previous prime is 1642675725541. The next prime is 1642675725661. The reversal of 1642675725571 is 1755275762461.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1642675725571 - 2²¹ = 1642673628419 is a prime.

It is a super-2 number, since 2×1642675725571² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1642675725541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821337862785 + 821337862786.

It is an arithmetic number, because the mean of its divisors is an integer number (821337862786).

Almost surely, 2^{1642675725571} is an apocalyptic number.

1642675725571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642675725571 is an equidigital number, since it uses as much as digits as its factorization.

1642675725571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696000, while the sum is 58.

The spelling of 1642675725571 in words is "one trillion, six hundred forty-two billion, six hundred seventy-five million, seven hundred twenty-five thousand, five hundred seventy-one".