661051115 has 8 divisors (see below), whose sum is σ = 795390288. Its totient is φ = 527421600.

The previous prime is 661051087. The next prime is 661051133. The reversal of 661051115 is 511150166.

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

It is not a de Polignac number, because 661051115 - 2⁶ = 661051051 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 175361 + ... + 179090.

It is an arithmetic number, because the mean of its divisors is an integer number (99423786).

Almost surely, 2^661051115 is an apocalyptic number.

661051115 is a deficient number, since it is larger than the sum of its proper divisors (134339173).

661051115 is a wasteful number, since it uses less digits than its factorization.

661051115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354829.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 661051115 is about 25710.9143166866. The cubic root of 661051115 is about 871.1207272450.

It can be divided in two parts, 661051 and 115, that added together give a palindrome (661166).

The spelling of 661051115 in words is "six hundred sixty-one million, fifty-one thousand, one hundred fifteen".