126980216557 has 4 divisors (see below), whose sum is σ = 126991742976. Its totient is φ = 126968690140.

The previous prime is 126980216537. The next prime is 126980216569. The reversal of 126980216557 is 755612089621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126980216557 - 2¹¹ = 126980214509 is a prime.

It is a super-2 number, since 2×126980216557² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126980216537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5746669 + ... + 5768722.

It is an arithmetic number, because the mean of its divisors is an integer number (31747935744).

Almost surely, 2^126980216557 is an apocalyptic number.

It is an amenable number.

126980216557 is a deficient number, since it is larger than the sum of its proper divisors (11526419).

126980216557 is a wasteful number, since it uses less digits than its factorization.

126980216557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11526418.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 126980216557 in words is "one hundred twenty-six billion, nine hundred eighty million, two hundred sixteen thousand, five hundred fifty-seven".