55221760661 has 8 divisors (see below), whose sum is σ = 56091875904. Its totient is φ = 54352995840.

The previous prime is 55221760639. The next prime is 55221760663. The reversal of 55221760661 is 16606712255.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55221760661 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 (55221760663) 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, 255020 + ... + 418901.

It is an arithmetic number, because the mean of its divisors is an integer number (7011484488).

Almost surely, 2^55221760661 is an apocalyptic number.

It is an amenable number.

55221760661 is a deficient number, since it is larger than the sum of its proper divisors (870115243).

55221760661 is a wasteful number, since it uses less digits than its factorization.

55221760661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675211.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 55221760661 in words is "fifty-five billion, two hundred twenty-one million, seven hundred sixty thousand, six hundred sixty-one".