55811197261 has 4 divisors (see below), whose sum is σ = 55824620800. Its totient is φ = 55797773724.

The previous prime is 55811197237. The next prime is 55811197279. The reversal of 55811197261 is 16279111855.

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 55811197261 - 2¹⁷ = 55811066189 is a prime.

It is a super-2 number, since 2×55811197261² (a number of 22 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 (55811197291) 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, 6705531 + ... + 6713848.

It is an arithmetic number, because the mean of its divisors is an integer number (13956155200).

Almost surely, 2^55811197261 is an apocalyptic number.

55811197261 is the 136396-th hex number and also the 105652-nd centered decagonal number.

It is an amenable number.

55811197261 is a deficient number, since it is larger than the sum of its proper divisors (13423539).

55811197261 is a wasteful number, since it uses less digits than its factorization.

55811197261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13423538.

The product of its digits is 151200, while the sum is 46.

The spelling of 55811197261 in words is "fifty-five billion, eight hundred eleven million, one hundred ninety-seven thousand, two hundred sixty-one".