161562036021 has 8 divisors (see below), whose sum is σ = 215619083424. Its totient is φ = 107606506320.

The previous prime is 161562036017. The next prime is 161562036029. The reversal of 161562036021 is 120630265161.

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

It is not a de Polignac number, because 161562036021 - 2² = 161562036017 is a prime.

It is a super-2 number, since 2×161562036021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161562036029) 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, 25375711 + ... + 25382076.

It is an arithmetic number, because the mean of its divisors is an integer number (26952385428).

Almost surely, 2^161562036021 is an apocalyptic number.

It is an amenable number.

161562036021 is a deficient number, since it is larger than the sum of its proper divisors (54057047403).

161562036021 is a wasteful number, since it uses less digits than its factorization.

161562036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50758851.

The product of its (nonzero) digits is 12960, while the sum is 33.

The spelling of 161562036021 in words is "one hundred sixty-one billion, five hundred sixty-two million, thirty-six thousand, twenty-one".