1667116749561 has 32 divisors (see below), whose sum is σ = 2345673738240. Its totient is φ = 1050279706944.

The previous prime is 1667116749547. The next prime is 1667116749587. The reversal of 1667116749561 is 1659476117661.

It is a happy number.

It is not a de Polignac number, because 1667116749561 - 2²⁷ = 1666982531833 is a prime.

It is a super-3 number, since 3×1667116749561³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1667116749495 and 1667116749504.

It is not an unprimeable number, because it can be changed into a prime (1667116749511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189807376 + ... + 189816158.

It is an arithmetic number, because the mean of its divisors is an integer number (73302304320).

Almost surely, 2^{1667116749561} is an apocalyptic number.

It is an amenable number.

1667116749561 is a deficient number, since it is larger than the sum of its proper divisors (678556988679).

1667116749561 is a wasteful number, since it uses less digits than its factorization.

1667116749561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16765.

The product of its digits is 11430720, while the sum is 60.

The spelling of 1667116749561 in words is "one trillion, six hundred sixty-seven billion, one hundred sixteen million, seven hundred forty-nine thousand, five hundred sixty-one".