641570450756 has 12 divisors (see below), whose sum is σ = 1124231449068. Its totient is φ = 320361465312.

The previous prime is 641570450749. The next prime is 641570450771. The reversal of 641570450756 is 657054075146.

It can be written as a sum of positive squares in 2 ways, for example, as 547955257600 + 93615193156 = 740240^2 + 305966^2 .

It is a super-2 number, since 2×641570450756² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105936611 + ... + 105942666.

It is an arithmetic number, because the mean of its divisors is an integer number (93685954089).

Almost surely, 2^641570450756 is an apocalyptic number.

It is an amenable number.

641570450756 is a deficient number, since it is larger than the sum of its proper divisors (482660998312).

641570450756 is a wasteful number, since it uses less digits than its factorization.

641570450756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211880038 (or 211880036 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 641570450756 in words is "six hundred forty-one billion, five hundred seventy million, four hundred fifty thousand, seven hundred fifty-six".