16155521001 has 24 divisors (see below), whose sum is σ = 24789336000. Its totient is φ = 10109865312.

The previous prime is 16155520991. The next prime is 16155521017. The reversal of 16155521001 is 10012555161.

16155521001 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 552 + 100 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-16155521001 is a prime.

It is a super-2 number, since 2×16155521001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16155521051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414741 + ... + 452018.

It is an arithmetic number, because the mean of its divisors is an integer number (1032889000).

Almost surely, 2^16155521001 is an apocalyptic number.

It is an amenable number.

16155521001 is a deficient number, since it is larger than the sum of its proper divisors (8633814999).

16155521001 is a wasteful number, since it uses less digits than its factorization.

16155521001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866893 (or 866890 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 16155521001 in words is "sixteen billion, one hundred fifty-five million, five hundred twenty-one thousand, one".