55161521157 has 8 divisors (see below), whose sum is σ = 73555027360. Its totient is φ = 36771181200.

The previous prime is 55161521153. The next prime is 55161521159. The reversal of 55161521157 is 75112516155.

It is a happy number.

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

It is not a de Polignac number, because 55161521157 - 2² = 55161521153 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 (55161521153) 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, 750607 + ... + 820812.

It is an arithmetic number, because the mean of its divisors is an integer number (9194378420).

Almost surely, 2^55161521157 is an apocalyptic number.

It is an amenable number.

55161521157 is a deficient number, since it is larger than the sum of its proper divisors (18393506203).

55161521157 is a wasteful number, since it uses less digits than its factorization.

55161521157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583123.

The product of its digits is 52500, while the sum is 39.

The spelling of 55161521157 in words is "fifty-five billion, one hundred sixty-one million, five hundred twenty-one thousand, one hundred fifty-seven".