53155551561 has 8 divisors (see below), whose sum is σ = 80998935744. Its totient is φ = 30374600880.

The previous prime is 53155551487. The next prime is 53155551583. The reversal of 53155551561 is 16515555135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53155551561 - 2⁹ = 53155551049 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (53155551461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1265608350 + ... + 1265608391.

It is an arithmetic number, because the mean of its divisors is an integer number (10124866968).

Almost surely, 2^53155551561 is an apocalyptic number.

It is an amenable number.

53155551561 is a deficient number, since it is larger than the sum of its proper divisors (27843384183).

53155551561 is a wasteful number, since it uses less digits than its factorization.

53155551561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531216751.

The product of its digits is 281250, while the sum is 42.

The spelling of 53155551561 in words is "fifty-three billion, one hundred fifty-five million, five hundred fifty-one thousand, five hundred sixty-one".