534378721566 has 16 divisors (see below), whose sum is σ = 1068769580688. Its totient is φ = 178124217600.

The previous prime is 534378721561. The next prime is 534378721589. The reversal of 534378721566 is 665127873435.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (534378721561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127636 + ... + 1041656.

It is an arithmetic number, because the mean of its divisors is an integer number (66798098793).

Almost surely, 2^534378721566 is an apocalyptic number.

534378721566 is an abundant number, since it is smaller than the sum of its proper divisors (534390859122).

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

534378721566 is a wasteful number, since it uses less digits than its factorization.

534378721566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011467.

The product of its digits is 25401600, while the sum is 57.

The spelling of 534378721566 in words is "five hundred thirty-four billion, three hundred seventy-eight million, seven hundred twenty-one thousand, five hundred sixty-six".