123081637957 has 4 divisors (see below), whose sum is σ = 123403000320. Its totient is φ = 122760275596.

The previous prime is 123081637859. The next prime is 123081637981. The reversal of 123081637957 is 759736180321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 759736180321 = 27953 ⋅27179057.

It is a cyclic number.

It is not a de Polignac number, because 123081637957 - 2¹¹ = 123081635909 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 (123081637057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160680607 + ... + 160681372.

It is an arithmetic number, because the mean of its divisors is an integer number (30850750080).

Almost surely, 2^123081637957 is an apocalyptic number.

It is an amenable number.

123081637957 is a deficient number, since it is larger than the sum of its proper divisors (321362363).

123081637957 is an equidigital number, since it uses as much as digits as its factorization.

123081637957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321362362.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 123081637957 in words is "one hundred twenty-three billion, eighty-one million, six hundred thirty-seven thousand, nine hundred fifty-seven".