1166555642507 has 16 divisors (see below), whose sum is σ = 1175255782272. Its totient is φ = 1157892196800.

The previous prime is 1166555642501. The next prime is 1166555642519. The reversal of 1166555642507 is 7052465556611.

It is a cyclic number.

It is not a de Polignac number, because 1166555642507 - 2¹⁸ = 1166555380363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1166555642501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109520132 + ... + 109530782.

It is an arithmetic number, because the mean of its divisors is an integer number (73453486392).

Almost surely, 2^{1166555642507} is an apocalyptic number.

1166555642507 is a deficient number, since it is larger than the sum of its proper divisors (8700139765).

1166555642507 is a wasteful number, since it uses less digits than its factorization.

1166555642507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12298.

The product of its (nonzero) digits is 7560000, while the sum is 53.

The spelling of 1166555642507 in words is "one trillion, one hundred sixty-six billion, five hundred fifty-five million, six hundred forty-two thousand, five hundred seven".