100666551 has 4 divisors (see below), whose sum is σ = 134222072. Its totient is φ = 67111032.

The previous prime is 100666547. The next prime is 100666583. The reversal of 100666551 is 155666001.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 100666551 - 2² = 100666547 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 (100666591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16777756 + ... + 16777761.

It is an arithmetic number, because the mean of its divisors is an integer number (33555518).

Almost surely, 2^100666551 is an apocalyptic number.

100666551 is a deficient number, since it is larger than the sum of its proper divisors (33555521).

100666551 is an equidigital number, since it uses as much as digits as its factorization.

100666551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33555520.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 100666551 is about 10033.2721980419. The cubic root of 100666551 is about 465.1878856876.

The spelling of 100666551 in words is "one hundred million, six hundred sixty-six thousand, five hundred fifty-one".