123999407613 has 6 divisors (see below), whose sum is σ = 179110255454. Its totient is φ = 82666271736.

The previous prime is 123999407603. The next prime is 123999407699. The reversal of 123999407613 is 316704999321.

It is a happy number.

123999407613 is a `hidden beast` number, since 12 + 3 + 9 + 9 + 9 + 4 + 0 + 7 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 66616642404 + 57382765209 = 258102^2 + 239547^2 .

It is not a de Polignac number, because 123999407613 - 2¹⁸ = 123999145469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123999407613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123999407603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6888855970 + ... + 6888855987.

Almost surely, 2^123999407613 is an apocalyptic number.

It is an amenable number.

123999407613 is a deficient number, since it is larger than the sum of its proper divisors (55110847841).

123999407613 is a wasteful number, since it uses less digits than its factorization.

123999407613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13777711963 (or 13777711960 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The spelling of 123999407613 in words is "one hundred twenty-three billion, nine hundred ninety-nine million, four hundred seven thousand, six hundred thirteen".