661011501101 has 8 divisors (see below), whose sum is σ = 755512488960. Its totient is φ = 566528206608.

The previous prime is 661011501097. The next prime is 661011501107. The reversal of 661011501101 is 101105110166.

It is a happy number.

661011501101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661011501101 - 2² = 661011501097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661011501107) 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, 4343186 + ... + 4492803.

It is an arithmetic number, because the mean of its divisors is an integer number (94439061120).

Almost surely, 2^661011501101 is an apocalyptic number.

It is an amenable number.

661011501101 is a deficient number, since it is larger than the sum of its proper divisors (94500987859).

661011501101 is a wasteful number, since it uses less digits than its factorization.

661011501101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8846683.

The product of its (nonzero) digits is 180, while the sum is 23.

Adding to 661011501101 its reverse (101105110166), we get a palindrome (762116611267).

The spelling of 661011501101 in words is "six hundred sixty-one billion, eleven million, five hundred one thousand, one hundred one".