123180699442 has 4 divisors (see below), whose sum is σ = 184771049166. Its totient is φ = 61590349720.

The previous prime is 123180699437. The next prime is 123180699443. The reversal of 123180699442 is 244996081321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244996081321 = 107 ⋅2289683003.

It can be written as a sum of positive squares in only one way, i.e., 71502225201 + 51678474241 = 267399^2 + 227329^2 .

It is a super-2 number, since 2×123180699442² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (123180699443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30795174859 + ... + 30795174862.

Almost surely, 2^123180699442 is an apocalyptic number.

123180699442 is a deficient number, since it is larger than the sum of its proper divisors (61590349724).

123180699442 is an equidigital number, since it uses as much as digits as its factorization.

123180699442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61590349723.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 123180699442 in words is "one hundred twenty-three billion, one hundred eighty million, six hundred ninety-nine thousand, four hundred forty-two".