78625533131 has 4 divisors (see below), whose sum is σ = 78627070632. Its totient is φ = 78623995632.

The previous prime is 78625533083. The next prime is 78625533139. The reversal of 78625533131 is 13133552687.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78625533131 - 2¹⁰ = 78625532107 is a prime.

It is a super-2 number, since 2×78625533131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78625533139) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 689306 + ... + 795231.

It is an arithmetic number, because the mean of its divisors is an integer number (19656767658).

Almost surely, 2^78625533131 is an apocalyptic number.

78625533131 is a deficient number, since it is larger than the sum of its proper divisors (1537501).

78625533131 is a wasteful number, since it uses less digits than its factorization.

78625533131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537500.

The product of its digits is 453600, while the sum is 44.

The spelling of 78625533131 in words is "seventy-eight billion, six hundred twenty-five million, five hundred thirty-three thousand, one hundred thirty-one".