43149512661 has 8 divisors (see below), whose sum is σ = 57771409344. Its totient is φ = 28646978880.

The previous prime is 43149512647. The next prime is 43149512671. The reversal of 43149512661 is 16621594134.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43149512661 - 2²⁶ = 43082403797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43149512671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29839881 + ... + 29841326.

It is an arithmetic number, because the mean of its divisors is an integer number (7221426168).

Almost surely, 2^43149512661 is an apocalyptic number.

It is an amenable number.

43149512661 is a deficient number, since it is larger than the sum of its proper divisors (14621896683).

43149512661 is a wasteful number, since it uses less digits than its factorization.

43149512661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59681451.

The product of its digits is 155520, while the sum is 42.

The spelling of 43149512661 in words is "forty-three billion, one hundred forty-nine million, five hundred twelve thousand, six hundred sixty-one".