18970802865 has 48 divisors (see below), whose sum is σ = 37594252800. Its totient is φ = 8669137536.

The previous prime is 18970802863. The next prime is 18970802899. The reversal of 18970802865 is 56820807981.

It is not a de Polignac number, because 18970802865 - 2¹ = 18970802863 is a prime.

It is a super-2 number, since 2×18970802865² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18970802863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 972831 + ... + 992139.

It is an arithmetic number, because the mean of its divisors is an integer number (783213600).

Almost surely, 2^18970802865 is an apocalyptic number.

18970802865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18970802865 is a deficient number, since it is larger than the sum of its proper divisors (18623449935).

18970802865 is a wasteful number, since it uses less digits than its factorization.

18970802865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446 (or 22443 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 18970802865 in words is "eighteen billion, nine hundred seventy million, eight hundred two thousand, eight hundred sixty-five".