64540049201992 has 128 divisors (see below), whose sum is σ = 157492877875200. Its totient is φ = 24106052044800.

The previous prime is 64540049201987. The next prime is 64540049202059. The reversal of 64540049201992 is 29910294004546.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33950367 + ... + 35800942.

It is an arithmetic number, because the mean of its divisors is an integer number (1230413108400).

Almost surely, 2^{64540049201992} is an apocalyptic number.

64540049201992 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

64540049201992 is an abundant number, since it is smaller than the sum of its proper divisors (92952828673208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64540049201992 is a wasteful number, since it uses less digits than its factorization.

64540049201992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69751407 (or 69751403 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 64540049201992 in words is "sixty-four trillion, five hundred forty billion, forty-nine million, two hundred one thousand, nine hundred ninety-two".