161756226556 has 24 divisors (see below), whose sum is σ = 284475076704. Its totient is φ = 80478090240.

The previous prime is 161756226529. The next prime is 161756226617. The reversal of 161756226556 is 655622657161.

It is a super-2 number, since 2×161756226556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381836 + ... + 1494316.

It is an arithmetic number, because the mean of its divisors is an integer number (11853128196).

Almost surely, 2^161756226556 is an apocalyptic number.

It is an amenable number.

161756226556 is a deficient number, since it is larger than the sum of its proper divisors (122718850148).

161756226556 is a wasteful number, since it uses less digits than its factorization.

161756226556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114261 (or 114259 counting only the distinct ones).

The product of its digits is 4536000, while the sum is 52.

The spelling of 161756226556 in words is "one hundred sixty-one billion, seven hundred fifty-six million, two hundred twenty-six thousand, five hundred fifty-six".