55250255549991 has 4 divisors (see below), whose sum is σ = 73667007399992. Its totient is φ = 36833503699992.

The previous prime is 55250255549989. The next prime is 55250255550041. The reversal of 55250255549991 is 19994555205255.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 55250255549991 - 2¹ = 55250255549989 is a prime.

It is a super-2 number, since 2×55250255549991² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55250255549971) 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, 9208375924996 + ... + 9208375925001.

It is an arithmetic number, because the mean of its divisors is an integer number (18416751849998).

Almost surely, 2^{55250255549991} is an apocalyptic number.

55250255549991 is a deficient number, since it is larger than the sum of its proper divisors (18416751850001).

55250255549991 is a wasteful number, since it uses less digits than its factorization.

55250255549991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18416751850000.

The product of its (nonzero) digits is 182250000, while the sum is 66.

The spelling of 55250255549991 in words is "fifty-five trillion, two hundred fifty billion, two hundred fifty-five million, five hundred forty-nine thousand, nine hundred ninety-one".