16164442778 has 32 divisors (see below), whose sum is σ = 27349843968. Its totient is φ = 7098562800.

The previous prime is 16164442769. The next prime is 16164442787. The reversal of 16164442778 is 87724446161.

It is an interprime number because it is at equal distance from previous prime (16164442769) and next prime (16164442787).

It is a super-2 number, since 2×16164442778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 394451 + ... + 433497.

It is an arithmetic number, because the mean of its divisors is an integer number (854682624).

Almost surely, 2^16164442778 is an apocalyptic number.

16164442778 is a deficient number, since it is larger than the sum of its proper divisors (11185401190).

16164442778 is a wasteful number, since it uses less digits than its factorization.

16164442778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39698.

The product of its digits is 1806336, while the sum is 50.

The spelling of 16164442778 in words is "sixteen billion, one hundred sixty-four million, four hundred forty-two thousand, seven hundred seventy-eight".