1661974695 has 48 divisors (see below), whose sum is σ = 2988209952. Its totient is φ = 853804800.

The previous prime is 1661974681. The next prime is 1661974739. The reversal of 1661974695 is 5964791661.

It is a happy number.

1661974695 is a `hidden beast` number, since 16 + 619 + 7 + 4 + 6 + 9 + 5 = 666.

It is not a de Polignac number, because 1661974695 - 2⁴ = 1661974679 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 (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 163224 + ... + 173106.

It is an arithmetic number, because the mean of its divisors is an integer number (62254374).

Almost surely, 2^1661974695 is an apocalyptic number.

1661974695 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1661974695 is a deficient number, since it is larger than the sum of its proper divisors (1326235257).

1661974695 is a wasteful number, since it uses less digits than its factorization.

1661974695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10032 (or 10029 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 1661974695 is about 40767.3238636043. The cubic root of 1661974695 is about 1184.5174663060.

The spelling of 1661974695 in words is "one billion, six hundred sixty-one million, nine hundred seventy-four thousand, six hundred ninety-five".