1997777322550 has 24 divisors (see below), whose sum is σ = 3716316287856. Its totient is φ = 799014054240.

The previous prime is 1997777322517. The next prime is 1997777322557. The reversal of 1997777322550 is 552237777991.

It is a super-3 number, since 3×1997777322550³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (64) 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 (1997777322557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2004589 + ... + 2830888.

It is an arithmetic number, because the mean of its divisors is an integer number (154846511994).

Almost surely, 2^{1997777322550} is an apocalyptic number.

1997777322550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1997777322550 is a deficient number, since it is larger than the sum of its proper divisors (1718538965306).

1997777322550 is a wasteful number, since it uses less digits than its factorization.

1997777322550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843752 (or 4843747 counting only the distinct ones).

The product of its (nonzero) digits is 58344300, while the sum is 64.

The spelling of 1997777322550 in words is "one trillion, nine hundred ninety-seven billion, seven hundred seventy-seven million, three hundred twenty-two thousand, five hundred fifty".