126665362477 has 4 divisors (see below), whose sum is σ = 126703598620. Its totient is φ = 126627126336.

The previous prime is 126665362457. The next prime is 126665362489. The reversal of 126665362477 is 774263566621.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114285239721 + 12380122756 = 338061^2 + 111266^2 .

It is a cyclic number.

It is not a de Polignac number, because 126665362477 - 2²⁷ = 126531144749 is a prime.

It is a super-2 number, since 2×126665362477² (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 (126665362457) 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, 19113102 + ... + 19119727.

It is an arithmetic number, because the mean of its divisors is an integer number (31675899655).

Almost surely, 2^126665362477 is an apocalyptic number.

It is an amenable number.

126665362477 is a deficient number, since it is larger than the sum of its proper divisors (38236143).

126665362477 is an equidigital number, since it uses as much as digits as its factorization.

126665362477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38236142.

The product of its digits is 15240960, while the sum is 55.

The spelling of 126665362477 in words is "one hundred twenty-six billion, six hundred sixty-five million, three hundred sixty-two thousand, four hundred seventy-seven".