123460720645 has 16 divisors (see below), whose sum is σ = 148324731120. Its totient is φ = 98654080000.

The previous prime is 123460720609. The next prime is 123460720657. The reversal of 123460720645 is 546027064321.

It can be written as a sum of positive squares in 8 ways, for example, as 16934857956 + 106525862689 = 130134^2 + 326383^2 .

It is not a de Polignac number, because 123460720645 - 2⁷ = 123460720517 is a prime.

It is a super-4 number, since 4×123460720645⁴ (a number of 45 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123460720598 and 123460720607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20233095 + ... + 20239195.

It is an arithmetic number, because the mean of its divisors is an integer number (9270295695).

Almost surely, 2^123460720645 is an apocalyptic number.

It is an amenable number.

123460720645 is a deficient number, since it is larger than the sum of its proper divisors (24864010475).

123460720645 is a wasteful number, since it uses less digits than its factorization.

123460720645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136.

The product of its (nonzero) digits is 241920, while the sum is 40.

Adding to 123460720645 its reverse (546027064321), we get a palindrome (669487784966).

The spelling of 123460720645 in words is "one hundred twenty-three billion, four hundred sixty million, seven hundred twenty thousand, six hundred forty-five".