1661655500106 has 32 divisors (see below), whose sum is σ = 3920588095488. Its totient is φ = 459443916720.

The previous prime is 1661655500101. The next prime is 1661655500129. The reversal of 1661655500106 is 6010055561661.

It is a super-2 number, since 2×1661655500106² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (1661655500101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638115250 + ... + 638117853.

It is an arithmetic number, because the mean of its divisors is an integer number (122518377984).

Almost surely, 2^{1661655500106} is an apocalyptic number.

1661655500106 is an abundant number, since it is smaller than the sum of its proper divisors (2258932595382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661655500106 is a wasteful number, since it uses less digits than its factorization.

1661655500106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276233146.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 1661655500106 in words is "one trillion, six hundred sixty-one billion, six hundred fifty-five million, five hundred thousand, one hundred six".