100615661 has 4 divisors (see below), whose sum is σ = 100822752. Its totient is φ = 100408572.

The previous prime is 100615649. The next prime is 100615699. The reversal of 100615661 is 166516001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100615661 - 2¹⁴ = 100599277 is a prime.

It is a super-2 number, since 2×100615661² = 20247022476933842, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100615661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100615601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102815 + ... + 103788.

It is an arithmetic number, because the mean of its divisors is an integer number (25205688).

Almost surely, 2^100615661 is an apocalyptic number.

It is an amenable number.

100615661 is a deficient number, since it is larger than the sum of its proper divisors (207091).

100615661 is an equidigital number, since it uses as much as digits as its factorization.

100615661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207090.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 100615661 is about 10030.7358154823. The cubic root of 100615661 is about 465.1094836047.

The spelling of 100615661 in words is "one hundred million, six hundred fifteen thousand, six hundred sixty-one".