661795166435 has 16 divisors (see below), whose sum is σ = 858791730720. Its totient is φ = 486682421760.

The previous prime is 661795166407. The next prime is 661795166453. The reversal of 661795166435 is 534661597166.

It is not a de Polignac number, because 661795166435 - 2²⁴ = 661778389219 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21107705 + ... + 21139034.

It is an arithmetic number, because the mean of its divisors is an integer number (53674483170).

Almost surely, 2^661795166435 is an apocalyptic number.

661795166435 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

661795166435 is a deficient number, since it is larger than the sum of its proper divisors (196996564285).

661795166435 is a wasteful number, since it uses less digits than its factorization.

661795166435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42246998.

The product of its digits is 24494400, while the sum is 59.

The spelling of 661795166435 in words is "six hundred sixty-one billion, seven hundred ninety-five million, one hundred sixty-six thousand, four hundred thirty-five".