556161611501 has 4 divisors (see below), whose sum is σ = 557063008572. Its totient is φ = 555260214432.

The previous prime is 556161611479. The next prime is 556161611527. The reversal of 556161611501 is 105116161655.

It is a happy number.

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 54435889225 + 501725722276 = 233315^2 + 708326^2 .

It is a cyclic number.

It is not a de Polignac number, because 556161611501 - 2¹⁴ = 556161595117 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 (556161611561) 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, 450697610 + ... + 450698843.

It is an arithmetic number, because the mean of its divisors is an integer number (139265752143).

Almost surely, 2^556161611501 is an apocalyptic number.

It is an amenable number.

556161611501 is a deficient number, since it is larger than the sum of its proper divisors (901397071).

556161611501 is an equidigital number, since it uses as much as digits as its factorization.

556161611501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901397070.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 556161611501 in words is "five hundred fifty-six billion, one hundred sixty-one million, six hundred eleven thousand, five hundred one".