661667051 has 8 divisors (see below), whose sum is σ = 667219200. Its totient is φ = 656130600.

The previous prime is 661667021. The next prime is 661667053. The reversal of 661667051 is 150766166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661667051 - 2²² = 657472747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 661666996 and 661667014.

It is not an unprimeable number, because it can be changed into a prime (661667053) 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 7 ways as a sum of consecutive naturals, for example, 89930 + ... + 97008.

It is an arithmetic number, because the mean of its divisors is an integer number (83402400).

Almost surely, 2^661667051 is an apocalyptic number.

661667051 is a deficient number, since it is larger than the sum of its proper divisors (5552149).

661667051 is a wasteful number, since it uses less digits than its factorization.

661667051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7849.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 661667051 is about 25722.8896316102. The cubic root of 661667051 is about 871.3911995503.

The spelling of 661667051 in words is "six hundred sixty-one million, six hundred sixty-seven thousand, fifty-one".