123641274465 has 24 divisors (see below), whose sum is σ = 226918105128. Its totient is φ = 62063070720.

The previous prime is 123641274461. The next prime is 123641274473. The reversal of 123641274465 is 564472146321.

123641274465 is a `hidden beast` number, since 1 + 2 + 3 + 64 + 127 + 4 + 465 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16529730624 + 107111543841 = 128568^2 + 327279^2 .

It is not a de Polignac number, because 123641274465 - 2² = 123641274461 is a prime.

It is a super-2 number, since 2×123641274465² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 123641274465.

It is not an unprimeable number, because it can be changed into a prime (123641274461) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80810526 + ... + 80812055.

It is an arithmetic number, because the mean of its divisors is an integer number (9454921047).

Almost surely, 2^123641274465 is an apocalyptic number.

123641274465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123641274465 is a deficient number, since it is larger than the sum of its proper divisors (103276830663).

123641274465 is a wasteful number, since it uses less digits than its factorization.

123641274465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161622609 (or 161622606 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The spelling of 123641274465 in words is "one hundred twenty-three billion, six hundred forty-one million, two hundred seventy-four thousand, four hundred sixty-five".