1550481955776 has 672 divisors, whose sum is σ = 5194326009600. Its totient is φ = 437915123712.

The previous prime is 1550481955741. The next prime is 1550481955777. The reversal of 1550481955776 is 6775591840551.

It is a happy number.

1550481955776 is a `hidden beast` number, since 1 + 5 + 5 + 0 + 4 + 8 + 1 + 9 + 557 + 76 = 666.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1550481955777) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 912584175 + ... + 912585873.

It is an arithmetic number, because the mean of its divisors is an integer number (7729651800).

Almost surely, 2^{1550481955776} is an apocalyptic number.

1550481955776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1550481955776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2597163004800).

1550481955776 is an abundant number, since it is smaller than the sum of its proper divisors (3643844053824).

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

1550481955776 is a wasteful number, since it uses less digits than its factorization.

1550481955776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 52920000, while the sum is 63.

The spelling of 1550481955776 in words is "one trillion, five hundred fifty billion, four hundred eighty-one million, nine hundred fifty-five thousand, seven hundred seventy-six".