55555550961 has 4 divisors (see below), whose sum is σ = 74074067952. Its totient is φ = 37037033972.

The previous prime is 55555550959. The next prime is 55555550989. The reversal of 55555550961 is 16905555555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55555550961 - 2¹ = 55555550959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55555554961) 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, 9259258491 + ... + 9259258496.

It is an arithmetic number, because the mean of its divisors is an integer number (18518516988).

Almost surely, 2^55555550961 is an apocalyptic number.

It is an amenable number.

55555550961 is a deficient number, since it is larger than the sum of its proper divisors (18518516991).

55555550961 is a wasteful number, since it uses less digits than its factorization.

55555550961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18518516990.

The product of its (nonzero) digits is 4218750, while the sum is 51.

The spelling of 55555550961 in words is "fifty-five billion, five hundred fifty-five million, five hundred fifty thousand, nine hundred sixty-one".