1166551616554 has 4 divisors (see below), whose sum is σ = 1749827424834. Its totient is φ = 583275808276.

The previous prime is 1166551616551. The next prime is 1166551616591. The reversal of 1166551616554 is 4556161556611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 887580673225 + 278970943329 = 942115^2 + 528177^2 .

It is not an unprimeable number, because it can be changed into a prime (1166551616551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 291637904137 + ... + 291637904140.

Almost surely, 2^{1166551616554} is an apocalyptic number.

1166551616554 is a deficient number, since it is larger than the sum of its proper divisors (583275808280).

1166551616554 is an equidigital number, since it uses as much as digits as its factorization.

1166551616554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583275808279.

The product of its digits is 3240000, while the sum is 52.

The spelling of 1166551616554 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-one million, six hundred sixteen thousand, five hundred fifty-four".