126640205365426 has 8 divisors (see below), whose sum is σ = 190924573571820. Its totient is φ = 62998680841488.

The previous prime is 126640205365393. The next prime is 126640205365433. The reversal of 126640205365426 is 624563502046621.

It can be written as a sum of positive squares in 2 ways, for example, as 125630584335025 + 1009621030401 = 11208505^2 + 1004799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×126640205365426² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160710920121 + ... + 160710920908.

Almost surely, 2^{126640205365426} is an apocalyptic number.

126640205365426 is a deficient number, since it is larger than the sum of its proper divisors (64284368206394).

126640205365426 is a wasteful number, since it uses less digits than its factorization.

126640205365426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321421841228.

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 126640205365426 in words is "one hundred twenty-six trillion, six hundred forty billion, two hundred five million, three hundred sixty-five thousand, four hundred twenty-six".