126451661 has 12 divisors (see below), whose sum is σ = 153519648. Its totient is φ = 102009792.

The previous prime is 126451609. The next prime is 126451673. The reversal of 126451661 is 166154621.

It is not a de Polignac number, because 126451661 - 2¹⁰ = 126450637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126451961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29231 + ... + 33276.

It is an arithmetic number, because the mean of its divisors is an integer number (12793304).

Almost surely, 2^126451661 is an apocalyptic number.

It is an amenable number.

126451661 is a deficient number, since it is larger than the sum of its proper divisors (27067987).

126451661 is an equidigital number, since it uses as much as digits as its factorization.

126451661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62548 (or 62531 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 126451661 is about 11245.0727432062. The cubic root of 126451661 is about 501.9281032783.

It can be divided in two parts, 1264 and 51661, that added together give a palindrome (52925).

The spelling of 126451661 in words is "one hundred twenty-six million, four hundred fifty-one thousand, six hundred sixty-one".