100661265 has 32 divisors (see below), whose sum is σ = 180821760. Its totient is φ = 53125632.

The previous prime is 100661251. The next prime is 100661279. The reversal of 100661265 is 562166001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (100661251) and next prime (100661279).

It is not a de Polignac number, because 100661265 - 2¹¹ = 100659217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 9252 + ... + 16938.

It is an arithmetic number, because the mean of its divisors is an integer number (5650680).

Almost surely, 2^100661265 is an apocalyptic number.

100661265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100661265 is a deficient number, since it is larger than the sum of its proper divisors (80160495).

100661265 is an equidigital number, since it uses as much as digits as its factorization.

100661265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7798 (or 7792 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 100661265 is about 10033.0087710517. The cubic root of 100661265 is about 465.1797432074.

The spelling of 100661265 in words is "one hundred million, six hundred sixty-one thousand, two hundred sixty-five".