161678407 has 4 divisors (see below), whose sum is σ = 176376456. Its totient is φ = 146980360.

The previous prime is 161678371. The next prime is 161678411. The reversal of 161678407 is 704876161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161678407 - 2²⁷ = 27460679 is a prime.

It is a super-2 number, since 2×161678407² = 52279814580115298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161678407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161678417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7349008 + ... + 7349029.

It is an arithmetic number, because the mean of its divisors is an integer number (44094114).

Almost surely, 2^161678407 is an apocalyptic number.

161678407 is a deficient number, since it is larger than the sum of its proper divisors (14698049).

161678407 is a wasteful number, since it uses less digits than its factorization.

161678407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14698048.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 161678407 is about 12715.2824191993. The cubic root of 161678407 is about 544.7752146535.

The spelling of 161678407 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, four hundred seven".