625687538191 has 16 divisors (see below), whose sum is σ = 645757425504. Its totient is φ = 605986596864.

The previous prime is 625687538173. The next prime is 625687538243. The reversal of 625687538191 is 191835786526.

It is a cyclic number.

It is not a de Polignac number, because 625687538191 - 2⁹ = 625687537679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625687530191) 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 15 ways as a sum of consecutive naturals, for example, 1348671 + ... + 1752223.

It is an arithmetic number, because the mean of its divisors is an integer number (40359839094).

Almost surely, 2^625687538191 is an apocalyptic number.

625687538191 is a deficient number, since it is larger than the sum of its proper divisors (20069887313).

625687538191 is a wasteful number, since it uses less digits than its factorization.

625687538191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404010.

The product of its digits is 21772800, while the sum is 61.

The spelling of 625687538191 in words is "six hundred twenty-five billion, six hundred eighty-seven million, five hundred thirty-eight thousand, one hundred ninety-one".