43401312557 has 4 divisors (see below), whose sum is σ = 43431601020. Its totient is φ = 43371024096.

The previous prime is 43401312551. The next prime is 43401312583. The reversal of 43401312557 is 75521310434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75521310434 = 2 ⋅37760655217.

It can be written as a sum of positive squares in 2 ways, for example, as 27793557796 + 15607754761 = 166714^2 + 124931^2 .

It is a cyclic number.

It is not a de Polignac number, because 43401312557 - 2⁴ = 43401312541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43401312551) 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, 15142082 + ... + 15144947.

It is an arithmetic number, because the mean of its divisors is an integer number (10857900255).

Almost surely, 2^43401312557 is an apocalyptic number.

It is an amenable number.

43401312557 is a deficient number, since it is larger than the sum of its proper divisors (30288463).

43401312557 is a wasteful number, since it uses less digits than its factorization.

43401312557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30288462.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 43401312557 in words is "forty-three billion, four hundred one million, three hundred twelve thousand, five hundred fifty-seven".