43604240121545 has 16 divisors (see below), whose sum is σ = 53601696851472. Its totient is φ = 34032331914240.

The previous prime is 43604240121499. The next prime is 43604240121557. The reversal of 43604240121545 is 54512104240634.

It can be written as a sum of positive squares in 8 ways, for example, as 17102500857289 + 26501739264256 = 4135517^2 + 5147984^2 .

It is not a de Polignac number, because 43604240121545 - 2²⁰ = 43604239072969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30861179 + ... + 32243151.

It is an arithmetic number, because the mean of its divisors is an integer number (3350106053217).

Almost surely, 2^{43604240121545} is an apocalyptic number.

It is an amenable number.

43604240121545 is a deficient number, since it is larger than the sum of its proper divisors (9997456729927).

43604240121545 is a wasteful number, since it uses less digits than its factorization.

43604240121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535932.

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 43604240121545 in words is "forty-three trillion, six hundred four billion, two hundred forty million, one hundred twenty-one thousand, five hundred forty-five".