126501661 has 16 divisors (see below), whose sum is σ = 149304960. Its totient is φ = 105664320.

The previous prime is 126501653. The next prime is 126501691. The reversal of 126501661 is 166105621.

It is a cyclic number.

It is not a de Polignac number, because 126501661 - 2³ = 126501653 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 (126501611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30816 + ... + 34678.

It is an arithmetic number, because the mean of its divisors is an integer number (9331560).

Almost surely, 2^126501661 is an apocalyptic number.

126501661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

126501661 is a deficient number, since it is larger than the sum of its proper divisors (22803299).

126501661 is a wasteful number, since it uses less digits than its factorization.

126501661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 126501661 is about 11247.2957194163. The cubic root of 126501661 is about 501.9942500254.

The spelling of 126501661 in words is "one hundred twenty-six million, five hundred one thousand, six hundred sixty-one".