109557626545 has 4 divisors (see below), whose sum is σ = 131469151860. Its totient is φ = 87646101232.

The previous prime is 109557626543. The next prime is 109557626567. The reversal of 109557626545 is 545626755901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545626755901 = 19 ⋅28717197679.

It can be written as a sum of positive squares in 2 ways, for example, as 82369574001 + 27188052544 = 287001^2 + 164888^2 .

It is a cyclic number.

It is not a de Polignac number, because 109557626545 - 2¹ = 109557626543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109557626543) 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, 10955762650 + ... + 10955762659.

It is an arithmetic number, because the mean of its divisors is an integer number (32867287965).

Almost surely, 2^109557626545 is an apocalyptic number.

It is an amenable number.

109557626545 is a deficient number, since it is larger than the sum of its proper divisors (21911525315).

109557626545 is an equidigital number, since it uses as much as digits as its factorization.

109557626545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21911525314.

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 109557626545 in words is "one hundred nine billion, five hundred fifty-seven million, six hundred twenty-six thousand, five hundred forty-five".