123849920105 has 16 divisors (see below), whose sum is σ = 155948042880. Its totient is φ = 94242643968.

The previous prime is 123849920027. The next prime is 123849920111. The reversal of 123849920105 is 501029948321.

It is a cyclic number.

It is not a de Polignac number, because 123849920105 - 2⁸ = 123849919849 is a prime.

It is a super-2 number, since 2×123849920105² (a number of 23 digits) contains 22 as substring.

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, 2987672 + ... + 3028841.

It is an arithmetic number, because the mean of its divisors is an integer number (9746752680).

Almost surely, 2^123849920105 is an apocalyptic number.

It is an amenable number.

123849920105 is a deficient number, since it is larger than the sum of its proper divisors (32098122775).

123849920105 is a wasteful number, since it uses less digits than its factorization.

123849920105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6016720.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 123849920105 in words is "one hundred twenty-three billion, eight hundred forty-nine million, nine hundred twenty thousand, one hundred five".