126513752506 has 4 divisors (see below), whose sum is σ = 189770628762. Its totient is φ = 63256876252.

The previous prime is 126513752489. The next prime is 126513752509. The reversal of 126513752506 is 605257315621.

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., 125074688281 + 1439064225 = 353659^2 + 37935^2 .

It is not an unprimeable number, because it can be changed into a prime (126513752509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31628438125 + ... + 31628438128.

Almost surely, 2^126513752506 is an apocalyptic number.

126513752506 is a deficient number, since it is larger than the sum of its proper divisors (63256876256).

126513752506 is an equidigital number, since it uses as much as digits as its factorization.

126513752506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63256876255.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 126513752506 in words is "one hundred twenty-six billion, five hundred thirteen million, seven hundred fifty-two thousand, five hundred six".