16001611557 has 8 divisors (see below), whose sum is σ = 21428651040. Its totient is φ = 10621156560.

The previous prime is 16001611529. The next prime is 16001611643. The reversal of 16001611557 is 75511610061.

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

It is not a de Polignac number, because 16001611557 - 2⁷ = 16001611429 is a prime.

It is a super-2 number, since 2×16001611557² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16001611057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11645319 + ... + 11646692.

It is an arithmetic number, because the mean of its divisors is an integer number (2678581380).

Almost surely, 2^16001611557 is an apocalyptic number.

It is an amenable number.

16001611557 is a deficient number, since it is larger than the sum of its proper divisors (5427039483).

16001611557 is a wasteful number, since it uses less digits than its factorization.

16001611557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23292243.

The product of its (nonzero) digits is 6300, while the sum is 33.

The spelling of 16001611557 in words is "sixteen billion, one million, six hundred eleven thousand, five hundred fifty-seven".