16400777361 has 16 divisors (see below), whose sum is σ = 22981024704. Its totient is φ = 10390935744.

The previous prime is 16400777339. The next prime is 16400777377. The reversal of 16400777361 is 16377700461.

It is not a de Polignac number, because 16400777361 - 2⁶ = 16400777297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16400777381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1713306 + ... + 1722851.

It is an arithmetic number, because the mean of its divisors is an integer number (1436314044).

Almost surely, 2^16400777361 is an apocalyptic number.

It is an amenable number.

16400777361 is a deficient number, since it is larger than the sum of its proper divisors (6580247343).

16400777361 is a wasteful number, since it uses less digits than its factorization.

16400777361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436240.

The product of its (nonzero) digits is 148176, while the sum is 42.

The spelling of 16400777361 in words is "sixteen billion, four hundred million, seven hundred seventy-seven thousand, three hundred sixty-one".