161124521651 has 4 divisors (see below), whose sum is σ = 163065781032. Its totient is φ = 159183262272.

The previous prime is 161124521627. The next prime is 161124521659. The reversal of 161124521651 is 156125421161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161124521651 is a prime.

It is a super-2 number, since 2×161124521651² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161124521659) 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, 970629566 + ... + 970629731.

It is an arithmetic number, because the mean of its divisors is an integer number (40766445258).

Almost surely, 2^161124521651 is an apocalyptic number.

161124521651 is a deficient number, since it is larger than the sum of its proper divisors (1941259381).

161124521651 is an equidigital number, since it uses as much as digits as its factorization.

161124521651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941259380.

The product of its digits is 14400, while the sum is 35.

The spelling of 161124521651 in words is "one hundred sixty-one billion, one hundred twenty-four million, five hundred twenty-one thousand, six hundred fifty-one".