55561778950 has 24 divisors (see below), whose sum is σ = 106678618560. Its totient is φ = 21507784800.

The previous prime is 55561778947. The next prime is 55561778969. The reversal of 55561778950 is 5987716555.

It is a super-2 number, since 2×55561778950² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17921605 + ... + 17924704.

It is an arithmetic number, because the mean of its divisors is an integer number (4444942440).

Almost surely, 2^55561778950 is an apocalyptic number.

55561778950 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55561778950 is a deficient number, since it is larger than the sum of its proper divisors (51116839610).

55561778950 is a wasteful number, since it uses less digits than its factorization.

55561778950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35846352 (or 35846347 counting only the distinct ones).

The product of its (nonzero) digits is 13230000, while the sum is 58.

The spelling of 55561778950 in words is "fifty-five billion, five hundred sixty-one million, seven hundred seventy-eight thousand, nine hundred fifty".