1087661053778 has 8 divisors (see below), whose sum is σ = 1756990933068. Its totient is φ = 501997409424.

The previous prime is 1087661053777. The next prime is 1087661053793. The reversal of 1087661053778 is 8773501667801.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1083354150649 + 4306903129 = 1040843^2 + 65627^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1087661053777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20916558701 + ... + 20916558752.

Almost surely, 2^{1087661053778} is an apocalyptic number.

1087661053778 is a deficient number, since it is larger than the sum of its proper divisors (669329879290).

1087661053778 is a wasteful number, since it uses less digits than its factorization.

1087661053778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41833117468.

The product of its (nonzero) digits is 11854080, while the sum is 59.

The spelling of 1087661053778 in words is "one trillion, eighty-seven billion, six hundred sixty-one million, fifty-three thousand, seven hundred seventy-eight".