123511040402 has 4 divisors (see below), whose sum is σ = 185266560606. Its totient is φ = 61755520200.

The previous prime is 123511040377. The next prime is 123511040437. The reversal of 123511040402 is 204040115321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 106831576201 + 16679464201 = 326851^2 + 129149^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30877760099 + ... + 30877760102.

Almost surely, 2^123511040402 is an apocalyptic number.

123511040402 is a deficient number, since it is larger than the sum of its proper divisors (61755520204).

123511040402 is an equidigital number, since it uses as much as digits as its factorization.

123511040402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61755520203.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 123511040402 its reverse (204040115321), we get a palindrome (327551155723).

The spelling of 123511040402 in words is "one hundred twenty-three billion, five hundred eleven million, forty thousand, four hundred two".