1601551656651 has 8 divisors (see below), whose sum is σ = 2170408802704. Its totient is φ = 1050197807520.

The previous prime is 1601551656613. The next prime is 1601551656659. The reversal of 1601551656651 is 1566561551061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1601551656651 - 2⁶ = 1601551656587 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601551656651.

It is not an unprimeable number, because it can be changed into a prime (1601551656659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4375824016 + ... + 4375824381.

It is an arithmetic number, because the mean of its divisors is an integer number (271301100338).

Almost surely, 2^{1601551656651} is an apocalyptic number.

1601551656651 is a deficient number, since it is larger than the sum of its proper divisors (568857146053).

1601551656651 is an equidigital number, since it uses as much as digits as its factorization.

1601551656651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8751648461.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 1601551656651 in words is "one trillion, six hundred one billion, five hundred fifty-one million, six hundred fifty-six thousand, six hundred fifty-one".