1678159957 has 4 divisors (see below), whose sum is σ = 1713865536. Its totient is φ = 1642454380.

The previous prime is 1678159939. The next prime is 1678159993. The reversal of 1678159957 is 7599518761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1678159957 - 2¹⁵ = 1678127189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1678159937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17852719 + ... + 17852812.

It is an arithmetic number, because the mean of its divisors is an integer number (428466384).

Almost surely, 2^1678159957 is an apocalyptic number.

It is an amenable number.

1678159957 is a deficient number, since it is larger than the sum of its proper divisors (35705579).

1678159957 is an equidigital number, since it uses as much as digits as its factorization.

1678159957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35705578.

The product of its digits is 4762800, while the sum is 58.

The square root of 1678159957 is about 40965.3506881120. The cubic root of 1678159957 is about 1188.3502212111.

The spelling of 1678159957 in words is "one billion, six hundred seventy-eight million, one hundred fifty-nine thousand, nine hundred fifty-seven".