106661156565 has 16 divisors (see below), whose sum is σ = 170743785408. Its totient is φ = 56857305216.

The previous prime is 106661156561. The next prime is 106661156621. The reversal of 106661156565 is 565651166601.

It is not a de Polignac number, because 106661156565 - 2² = 106661156561 is a prime.

It is a super-2 number, since 2×106661156565² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106661156561) 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, 1759512 + ... + 1819121.

It is an arithmetic number, because the mean of its divisors is an integer number (10671486588).

Almost surely, 2^106661156565 is an apocalyptic number.

106661156565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

106661156565 is a deficient number, since it is larger than the sum of its proper divisors (64082628843).

106661156565 is a wasteful number, since it uses less digits than its factorization.

106661156565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3580628.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 106661156565 in words is "one hundred six billion, six hundred sixty-one million, one hundred fifty-six thousand, five hundred sixty-five".