161302611553 has 4 divisors (see below), whose sum is σ = 164346057108. Its totient is φ = 158259166000.

The previous prime is 161302611539. The next prime is 161302611559. The reversal of 161302611553 is 355116203161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127157854464 + 34144757089 = 356592^2 + 184783^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161302611553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161302611559) 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, 1521722698 + ... + 1521722803.

It is an arithmetic number, because the mean of its divisors is an integer number (41086514277).

Almost surely, 2^161302611553 is an apocalyptic number.

It is an amenable number.

161302611553 is a deficient number, since it is larger than the sum of its proper divisors (3043445555).

161302611553 is an equidigital number, since it uses as much as digits as its factorization.

161302611553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043445554.

The product of its (nonzero) digits is 16200, while the sum is 34.

The spelling of 161302611553 in words is "one hundred sixty-one billion, three hundred two million, six hundred eleven thousand, five hundred fifty-three".