16161861477 has 4 divisors (see below), whose sum is σ = 21549148640. Its totient is φ = 10774574316.

The previous prime is 16161861451. The next prime is 16161861487. The reversal of 16161861477 is 77416816161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16161861477 - 2⁷ = 16161861349 is a prime.

It is a super-2 number, since 2×16161861477² (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 (16161861407) 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 3 ways as a sum of consecutive naturals, for example, 2693643577 + ... + 2693643582.

It is an arithmetic number, because the mean of its divisors is an integer number (5387287160).

Almost surely, 2^16161861477 is an apocalyptic number.

It is an amenable number.

16161861477 is a deficient number, since it is larger than the sum of its proper divisors (5387287163).

16161861477 is an equidigital number, since it uses as much as digits as its factorization.

16161861477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5387287162.

The product of its digits is 338688, while the sum is 48.

The spelling of 16161861477 in words is "sixteen billion, one hundred sixty-one million, eight hundred sixty-one thousand, four hundred seventy-seven".