40861601566864 has 45 divisors (see below), whose sum is σ = 85728458361483. Its totient is φ = 18859047307776.

The previous prime is 40861601566831. The next prime is 40861601566939. The reversal of 40861601566864 is 46866510616804.

It is a happy number.

The square root of 40861601566864 is 6392308.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 27490936512400 + 13370665054464 = 5243180^2 + 3656592^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 332338552 + ... + 332461480.

Almost surely, 2^{40861601566864} is an apocalyptic number.

40861601566864 is the 6392308-th square number.

It is an amenable number.

40861601566864 is an abundant number, since it is smaller than the sum of its proper divisors (44866856794619).

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

40861601566864 is an frugal number, since it uses more digits than its factorization.

40861601566864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245892 (or 122944 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 61.

The spelling of 40861601566864 in words is "forty trillion, eight hundred sixty-one billion, six hundred one million, five hundred sixty-six thousand, eight hundred sixty-four".