123745440521 has 8 divisors (see below), whose sum is σ = 124342034688. Its totient is φ = 123150280000.

The previous prime is 123745440517. The next prime is 123745440563. The reversal of 123745440521 is 125044547321.

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

It is a cyclic number.

It is not a de Polignac number, because 123745440521 - 2² = 123745440517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123745440821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185165 + ... + 530826.

It is an arithmetic number, because the mean of its divisors is an integer number (15542754336).

Almost surely, 2^123745440521 is an apocalyptic number.

It is an amenable number.

123745440521 is a deficient number, since it is larger than the sum of its proper divisors (596594167).

123745440521 is an equidigital number, since it uses as much as digits as its factorization.

123745440521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716823.

The product of its (nonzero) digits is 134400, while the sum is 38.

Adding to 123745440521 its reverse (125044547321), we get a palindrome (248789987842).

The spelling of 123745440521 in words is "one hundred twenty-three billion, seven hundred forty-five million, four hundred forty thousand, five hundred twenty-one".