1561776497790 has 16 divisors (see below), whose sum is σ = 3748263594768. Its totient is φ = 416473732736.

The previous prime is 1561776497737. The next prime is 1561776497791. The reversal of 1561776497790 is 977946771651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561776497791) 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 7 ways as a sum of consecutive naturals, for example, 26029608267 + ... + 26029608326.

It is an arithmetic number, because the mean of its divisors is an integer number (234266474673).

Almost surely, 2^{1561776497790} is an apocalyptic number.

1561776497790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1561776497790 is an abundant number, since it is smaller than the sum of its proper divisors (2186487096978).

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

1561776497790 is a wasteful number, since it uses less digits than its factorization.

1561776497790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52059216603.

The product of its (nonzero) digits is 140026320, while the sum is 69.

The spelling of 1561776497790 in words is "one trillion, five hundred sixty-one billion, seven hundred seventy-six million, four hundred ninety-seven thousand, seven hundred ninety".