123625377521 has 4 divisors (see below), whose sum is σ = 123632569344. Its totient is φ = 123618185700.

The previous prime is 123625377511. The next prime is 123625377553. The reversal of 123625377521 is 125773526321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123625377521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123625377511) 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, 3570065 + ... + 3604526.

It is an arithmetic number, because the mean of its divisors is an integer number (30908142336).

Almost surely, 2^123625377521 is an apocalyptic number.

It is an amenable number.

123625377521 is a deficient number, since it is larger than the sum of its proper divisors (7191823).

123625377521 is an equidigital number, since it uses as much as digits as its factorization.

123625377521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7191822.

The product of its digits is 529200, while the sum is 44.

The spelling of 123625377521 in words is "one hundred twenty-three billion, six hundred twenty-five million, three hundred seventy-seven thousand, five hundred twenty-one".