1658378661 has 8 divisors (see below), whose sum is σ = 2214612960. Its totient is φ = 1103865072.

The previous prime is 1658378641. The next prime is 1658378669. The reversal of 1658378661 is 1668738561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1658378661 - 2⁹ = 1658378149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1658378669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427926 + ... + 431783.

It is an arithmetic number, because the mean of its divisors is an integer number (276826620).

Almost surely, 2^1658378661 is an apocalyptic number.

It is an amenable number.

1658378661 is a deficient number, since it is larger than the sum of its proper divisors (556234299).

1658378661 is an equidigital number, since it uses as much as digits as its factorization.

1658378661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860355.

The product of its digits is 1451520, while the sum is 51.

The square root of 1658378661 is about 40723.1956138022. The cubic root of 1658378661 is about 1183.6625313200.

The spelling of 1658378661 in words is "one billion, six hundred fifty-eight million, three hundred seventy-eight thousand, six hundred sixty-one".