126540221644 has 24 divisors (see below), whose sum is σ = 221745384000. Its totient is φ = 63184458960.

The previous prime is 126540221617. The next prime is 126540221657. The reversal of 126540221644 is 446122045621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10564579 + ... + 10576549.

It is an arithmetic number, because the mean of its divisors is an integer number (9239391000).

Almost surely, 2^126540221644 is an apocalyptic number.

It is an amenable number.

126540221644 is a deficient number, since it is larger than the sum of its proper divisors (95205162356).

126540221644 is a wasteful number, since it uses less digits than its factorization.

126540221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15333 (or 15331 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 126540221644 in words is "one hundred twenty-six billion, five hundred forty million, two hundred twenty-one thousand, six hundred forty-four".