1578798661 has 8 divisors (see below), whose sum is σ = 1722952800. Its totient is φ = 1434749040.

The previous prime is 1578798649. The next prime is 1578798691. The reversal of 1578798661 is 1668978751.

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

It is a cyclic number.

It is not a de Polignac number, because 1578798661 - 2⁵ = 1578798629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1578798596 and 1578798605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1578798691) 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, 7330 + ... + 56668.

It is an arithmetic number, because the mean of its divisors is an integer number (215369100).

Almost surely, 2^1578798661 is an apocalyptic number.

1578798661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1578798661 is a deficient number, since it is larger than the sum of its proper divisors (144154139).

1578798661 is a wasteful number, since it uses less digits than its factorization.

1578798661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52259.

The product of its digits is 5080320, while the sum is 58.

The square root of 1578798661 is about 39734.0994738776. The cubic root of 1578798661 is about 1164.4180165224.

The spelling of 1578798661 in words is "one billion, five hundred seventy-eight million, seven hundred ninety-eight thousand, six hundred sixty-one".