5181572816 has 30 divisors (see below), whose sum is σ = 11678368050. Its totient is φ = 2220673728.

The previous prime is 5181572813. The next prime is 5181572861. The reversal of 5181572816 is 6182751815.

It can be written as a sum of positive squares in only one way, i.e., 4201632400 + 979940416 = 64820^2 + 31304^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5181572813) 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, 3303791 + ... + 3305358.

It is an arithmetic number, because the mean of its divisors is an integer number (389278935).

Almost surely, 2^5181572816 is an apocalyptic number.

5181572816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

5181572816 is an abundant number, since it is smaller than the sum of its proper divisors (6496795234).

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

5181572816 is a wasteful number, since it uses less digits than its factorization.

5181572816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6609171 (or 6609158 counting only the distinct ones).

The product of its digits is 134400, while the sum is 44.

The square root of 5181572816 is about 71983.1425821352. The cubic root of 5181572816 is about 1730.4293337856.

The spelling of 5181572816 in words is "five billion, one hundred eighty-one million, five hundred seventy-two thousand, eight hundred sixteen".