45378440557 has 4 divisors (see below), whose sum is σ = 45382399036. Its totient is φ = 45374482080.

The previous prime is 45378440533. The next prime is 45378440573. The reversal of 45378440557 is 75504487354.

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 9088571556 + 36289869001 = 95334^2 + 190499^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-45378440557 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 (45378440587) 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, 1961994 + ... + 1984987.

It is an arithmetic number, because the mean of its divisors is an integer number (11345599759).

Almost surely, 2^45378440557 is an apocalyptic number.

It is an amenable number.

45378440557 is a deficient number, since it is larger than the sum of its proper divisors (3958479).

45378440557 is a wasteful number, since it uses less digits than its factorization.

45378440557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958478.

The product of its (nonzero) digits is 9408000, while the sum is 52.

The spelling of 45378440557 in words is "forty-five billion, three hundred seventy-eight million, four hundred forty thousand, five hundred fifty-seven".