1166890987515 has 64 divisors (see below), whose sum is σ = 2058778455552. Its totient is φ = 559653580800.

The previous prime is 1166890987481. The next prime is 1166890987517. The reversal of 1166890987515 is 5157890986611.

It is a happy number.

It is not a de Polignac number, because 1166890987515 - 2¹³ = 1166890979323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1166890987517) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34089549 + ... + 34123761.

It is an arithmetic number, because the mean of its divisors is an integer number (32168413368).

Almost surely, 2^{1166890987515} is an apocalyptic number.

1166890987515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1166890987515 is a deficient number, since it is larger than the sum of its proper divisors (891887468037).

1166890987515 is a wasteful number, since it uses less digits than its factorization.

1166890987515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36460.

The product of its (nonzero) digits is 32659200, while the sum is 66.

The spelling of 1166890987515 in words is "one trillion, one hundred sixty-six billion, eight hundred ninety million, nine hundred eighty-seven thousand, five hundred fifteen".