161620552 has 16 divisors (see below), whose sum is σ = 303242940. Its totient is φ = 80755776.

The previous prime is 161620541. The next prime is 161620559. The reversal of 161620552 is 255026161.

It can be written as a sum of positive squares in 2 ways, for example, as 158911236 + 2709316 = 12606^2 + 1646^2 .

It is a super-2 number, since 2×161620552² = 52242405657569408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161620552.

It is not an unprimeable number, because it can be changed into a prime (161620559) 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, 7578 + ... + 19510.

Almost surely, 2^161620552 is an apocalyptic number.

It is an amenable number.

161620552 is a deficient number, since it is larger than the sum of its proper divisors (141622388).

161620552 is a wasteful number, since it uses less digits than its factorization.

161620552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13632 (or 13628 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 161620552 is about 12713.0071973550. The cubic root of 161620552 is about 544.7102261147.

The spelling of 161620552 in words is "one hundred sixty-one million, six hundred twenty thousand, five hundred fifty-two".