16461517591 has 16 divisors (see below), whose sum is σ = 16687550880. Its totient is φ = 16237549440.

The previous prime is 16461517547. The next prime is 16461517601. The reversal of 16461517591 is 19571516461.

It is a cyclic number.

It is not a de Polignac number, because 16461517591 - 2¹³ = 16461509399 is a prime.

It is a super-2 number, since 2×16461517591² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16461517531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18148960 + ... + 18149866.

It is an arithmetic number, because the mean of its divisors is an integer number (1042971930).

Almost surely, 2^16461517591 is an apocalyptic number.

16461517591 is a deficient number, since it is larger than the sum of its proper divisors (226033289).

16461517591 is a wasteful number, since it uses less digits than its factorization.

16461517591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794.

The product of its digits is 226800, while the sum is 46.

The spelling of 16461517591 in words is "sixteen billion, four hundred sixty-one million, five hundred seventeen thousand, five hundred ninety-one".