161551050600661 has 8 divisors (see below), whose sum is σ = 171072023330880. Its totient is φ = 152131906456128.

The previous prime is 161551050600647. The next prime is 161551050600671. The reversal of 161551050600661 is 166006050155161.

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

It is a cyclic number.

It is not a de Polignac number, because 161551050600661 - 2¹³ = 161551050592469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161551050600671) 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, 25457143156 + ... + 25457149501.

It is an arithmetic number, because the mean of its divisors is an integer number (21384002916360).

Almost surely, 2^{161551050600661} is an apocalyptic number.

It is an amenable number.

161551050600661 is a deficient number, since it is larger than the sum of its proper divisors (9520972730219).

161551050600661 is a wasteful number, since it uses less digits than its factorization.

161551050600661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50914292843.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161551050600661 in words is "one hundred sixty-one trillion, five hundred fifty-one billion, fifty million, six hundred thousand, six hundred sixty-one".