661906095 has 32 divisors (see below), whose sum is σ = 1086649344. Its totient is φ = 343862400.

The previous prime is 661906057. The next prime is 661906117. The reversal of 661906095 is 590609166.

It is not a de Polignac number, because 661906095 - 2⁷ = 661905967 is a prime.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 276805 + ... + 279185.

It is an arithmetic number, because the mean of its divisors is an integer number (33957792).

Almost surely, 2^661906095 is an apocalyptic number.

661906095 is a deficient number, since it is larger than the sum of its proper divisors (424743249).

661906095 is a wasteful number, since it uses less digits than its factorization.

661906095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2863.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 661906095 is about 25727.5357350835. The cubic root of 661906095 is about 871.4961243047.

The spelling of 661906095 in words is "six hundred sixty-one million, nine hundred six thousand, ninety-five".