10511511661 has 8 divisors (see below), whose sum is σ = 12013913600. Its totient is φ = 9009299088.

The previous prime is 10511511649. The next prime is 10511511667. The reversal of 10511511661 is 16611511501.

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

It is a cyclic number.

It is not a de Polignac number, because 10511511661 - 2⁵ = 10511511629 is a prime.

It is a super-2 number, since 2×10511511661² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10511511667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103780 + ... + 178306.

It is an arithmetic number, because the mean of its divisors is an integer number (1501739200).

Almost surely, 2^10511511661 is an apocalyptic number.

It is an amenable number.

10511511661 is a deficient number, since it is larger than the sum of its proper divisors (1502401939).

10511511661 is an equidigital number, since it uses as much as digits as its factorization.

10511511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94683.

The product of its (nonzero) digits is 900, while the sum is 28.

The spelling of 10511511661 in words is "ten billion, five hundred eleven million, five hundred eleven thousand, six hundred sixty-one".