550778336658 has 256 divisors, whose sum is σ = 1421779599360. Its totient is φ = 156492000000.

The previous prime is 550778336657. The next prime is 550778336659. The reversal of 550778336658 is 856633877055.

It is a happy number.

550778336658 is a `hidden beast` number, since 5 + 507 + 78 + 3 + 3 + 6 + 6 + 58 = 666.

It is an interprime number because it is at equal distance from previous prime (550778336657) and next prime (550778336659).

It is a super-2 number, since 2×550778336658² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 550778336595 and 550778336604.

It is not an unprimeable number, because it can be changed into a prime (550778336657) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 87408108 + ... + 87414408.

It is an arithmetic number, because the mean of its divisors is an integer number (5553826560).

Almost surely, 2^550778336658 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550778336658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710889799680).

550778336658 is an abundant number, since it is smaller than the sum of its proper divisors (871001262702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

550778336658 is a wasteful number, since it uses less digits than its factorization.

550778336658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6502 (or 6496 counting only the distinct ones).

The product of its (nonzero) digits is 127008000, while the sum is 63.

The spelling of 550778336658 in words is "five hundred fifty billion, seven hundred seventy-eight million, three hundred thirty-six thousand, six hundred fifty-eight".