55561115537 has 2 divisors, whose sum is σ = 55561115538. Its totient is φ = 55561115536.

The previous prime is 55561115513. The next prime is 55561115639. The reversal of 55561115537 is 73551116555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28807933441 + 26753182096 = 169729^2 + 163564^2 .

It is a cyclic number.

It is not a de Polignac number, because 55561115537 - 2⁶ = 55561115473 is a prime.

It is not a weakly prime, because it can be changed into another prime (55561111537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780557768 + 27780557769.

It is an arithmetic number, because the mean of its divisors is an integer number (27780557769).

Almost surely, 2^55561115537 is an apocalyptic number.

It is an amenable number.

55561115537 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561115537 is an equidigital number, since it uses as much as digits as its factorization.

55561115537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393750, while the sum is 44.

The spelling of 55561115537 in words is "fifty-five billion, five hundred sixty-one million, one hundred fifteen thousand, five hundred thirty-seven".