40043752661 has 12 divisors (see below), whose sum is σ = 44290768320. Its totient is φ = 35904682080.

The previous prime is 40043752627. The next prime is 40043752687. The reversal of 40043752661 is 16625734004.

It is a happy number.

40043752661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40043752661 - 2³⁰ = 38970010837 is a prime.

It is a super-4 number, since 4×40043752661⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043752691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282941 + ... + 400178.

It is an arithmetic number, because the mean of its divisors is an integer number (3690897360).

Almost surely, 2^40043752661 is an apocalyptic number.

It is an amenable number.

40043752661 is a deficient number, since it is larger than the sum of its proper divisors (4247015659).

40043752661 is an equidigital number, since it uses as much as digits as its factorization.

40043752661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683276 (or 683203 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 40043752661 in words is "forty billion, forty-three million, seven hundred fifty-two thousand, six hundred sixty-one".