43663670401 has 4 divisors (see below), whose sum is σ = 47022414292. Its totient is φ = 40304926512.

The previous prime is 43663670399. The next prime is 43663670443. The reversal of 43663670401 is 10407636634.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26835354225 + 16828316176 = 163815^2 + 129724^2 .

It is a cyclic number.

It is not a de Polignac number, because 43663670401 - 2¹ = 43663670399 is a prime.

It is a super-2 number, since 2×43663670401² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43663670801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679371926 + ... + 1679371951.

It is an arithmetic number, because the mean of its divisors is an integer number (11755603573).

Almost surely, 2^43663670401 is an apocalyptic number.

It is an amenable number.

43663670401 is a deficient number, since it is larger than the sum of its proper divisors (3358743891).

43663670401 is a wasteful number, since it uses less digits than its factorization.

43663670401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358743890.

The product of its (nonzero) digits is 217728, while the sum is 40.

The spelling of 43663670401 in words is "forty-three billion, six hundred sixty-three million, six hundred seventy thousand, four hundred one".