16778555431 has 8 divisors (see below), whose sum is σ = 18305683200. Its totient is φ = 15251728440.

The previous prime is 16778555393. The next prime is 16778555477. The reversal of 16778555431 is 13455587761.

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 16778555431 - 2²³ = 16770166823 is a prime.

It is a super-2 number, since 2×16778555431² (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 (16778555231) 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, 50610 + ... + 190048.

It is an arithmetic number, because the mean of its divisors is an integer number (2288210400).

Almost surely, 2^16778555431 is an apocalyptic number.

16778555431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16778555431 is a deficient number, since it is larger than the sum of its proper divisors (1527127769).

16778555431 is a wasteful number, since it uses less digits than its factorization.

16778555431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150389.

The product of its digits is 3528000, while the sum is 52.

The spelling of 16778555431 in words is "sixteen billion, seven hundred seventy-eight million, five hundred fifty-five thousand, four hundred thirty-one".