18172077696 has 48 divisors (see below), whose sum is σ = 52292049810. Its totient is φ = 6057358848.

The previous prime is 18172077691. The next prime is 18172077709. The reversal of 18172077696 is 69677027181.

It can be written as a sum of positive squares in only one way, i.e., 13210284096 + 4961793600 = 114936^2 + 70440^2 .

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (18172077691) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7886035 + ... + 7888338.

Almost surely, 2^18172077696 is an apocalyptic number.

18172077696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18172077696 is an abundant number, since it is smaller than the sum of its proper divisors (34119972114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18172077696 is a wasteful number, since it uses less digits than its factorization.

18172077696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15774393 (or 15774378 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The spelling of 18172077696 in words is "eighteen billion, one hundred seventy-two million, seventy-seven thousand, six hundred ninety-six".