43721265665425 has 12 divisors (see below), whose sum is σ = 54610094753676. Its totient is φ = 34721705868800.

The previous prime is 43721265665417. The next prime is 43721265665501. The reversal of 43721265665425 is 52456656212734.

It can be written as a sum of positive squares in 6 ways, for example, as 6530094481 + 43714735570944 = 80809^2 + 6611712^2 .

It is not a de Polignac number, because 43721265665425 - 2³ = 43721265665417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43721265665425.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6382663096 + ... + 6382669945.

It is an arithmetic number, because the mean of its divisors is an integer number (4550841229473).

Almost surely, 2^{43721265665425} is an apocalyptic number.

It is an amenable number.

43721265665425 is a deficient number, since it is larger than the sum of its proper divisors (10888829088251).

43721265665425 is a wasteful number, since it uses less digits than its factorization.

43721265665425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12765333188 (or 12765333183 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 58.

The spelling of 43721265665425 in words is "forty-three trillion, seven hundred twenty-one billion, two hundred sixty-five million, six hundred sixty-five thousand, four hundred twenty-five".