126551420405 has 16 divisors (see below), whose sum is σ = 152211486960. Its totient is φ = 101008086528.

The previous prime is 126551420393. The next prime is 126551420423. The reversal of 126551420405 is 504024155621.

It can be written as a sum of positive squares in 8 ways, for example, as 20467021969 + 106084398436 = 143063^2 + 325706^2 .

It is a cyclic number.

It is not a de Polignac number, because 126551420405 - 2¹² = 126551416309 is a prime.

It is a congruent number.

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, 9748499 + ... + 9761471.

It is an arithmetic number, because the mean of its divisors is an integer number (9513217935).

Almost surely, 2^126551420405 is an apocalyptic number.

It is an amenable number.

126551420405 is a deficient number, since it is larger than the sum of its proper divisors (25660066555).

126551420405 is a wasteful number, since it uses less digits than its factorization.

126551420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17320.

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 126551420405 in words is "one hundred twenty-six billion, five hundred fifty-one million, four hundred twenty thousand, four hundred five".