55187602581 has 8 divisors (see below), whose sum is σ = 73613674144. Its totient is φ = 36776633040.

The previous prime is 55187602577. The next prime is 55187602621. The reversal of 55187602581 is 18520678155.

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

It is not a de Polignac number, because 55187602581 - 2² = 55187602577 is a prime.

It is a super-2 number, since 2×55187602581² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55187602581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55187602381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3766975 + ... + 3781596.

It is an arithmetic number, because the mean of its divisors is an integer number (9201709268).

Almost surely, 2^55187602581 is an apocalyptic number.

It is an amenable number.

55187602581 is a deficient number, since it is larger than the sum of its proper divisors (18426071563).

55187602581 is a wasteful number, since it uses less digits than its factorization.

55187602581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7551011.

The product of its (nonzero) digits is 672000, while the sum is 48.

The spelling of 55187602581 in words is "fifty-five billion, one hundred eighty-seven million, six hundred two thousand, five hundred eighty-one".