161601105505001 has 8 divisors (see below), whose sum is σ = 162278667432960. Its totient is φ = 160923555299808.

The previous prime is 161601105504977. The next prime is 161601105505003. The reversal of 161601105505001 is 100505501106161.

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 161601105505001 - 2²² = 161601101310697 is a prime.

It is a super-2 number, since 2×161601105505001² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161601105505003) 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, 25265045 + ... + 31008461.

It is an arithmetic number, because the mean of its divisors is an integer number (20284833429120).

Almost surely, 2^{161601105505001} is an apocalyptic number.

It is an amenable number.

161601105505001 is a deficient number, since it is larger than the sum of its proper divisors (677561927959).

161601105505001 is a wasteful number, since it uses less digits than its factorization.

161601105505001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5861383.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 161601105505001 in words is "one hundred sixty-one trillion, six hundred one billion, one hundred five million, five hundred five thousand, one".