78285553503 has 8 divisors (see below), whose sum is σ = 110520781488. Its totient is φ = 49120347264.

The previous prime is 78285553501. The next prime is 78285553523. The reversal of 78285553503 is 30535558287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78285553503 - 2¹ = 78285553501 is a prime.

It is a super-2 number, since 2×78285553503² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1535010853 = 78285553503 / (7 + 8 + 2 + 8 + 5 + 5 + 5 + 3 + 5 + 0 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78285553501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767505376 + ... + 767505477.

It is an arithmetic number, because the mean of its divisors is an integer number (13815097686).

Almost surely, 2^78285553503 is an apocalyptic number.

78285553503 is a deficient number, since it is larger than the sum of its proper divisors (32235227985).

78285553503 is a wasteful number, since it uses less digits than its factorization.

78285553503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535010873.

The product of its (nonzero) digits is 5040000, while the sum is 51.

The spelling of 78285553503 in words is "seventy-eight billion, two hundred eighty-five million, five hundred fifty-three thousand, five hundred three".