1657213456420 has 12 divisors (see below), whose sum is σ = 3480148258524. Its totient is φ = 662885382560.

The previous prime is 1657213456403. The next prime is 1657213456427. The reversal of 1657213456420 is 246543127561.

It can be written as a sum of positive squares in 2 ways, for example, as 433574839296 + 1223638617124 = 658464^2 + 1106182^2 .

It is not an unprimeable number, because it can be changed into a prime (1657213456427) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 41430336391 + ... + 41430336430.

It is an arithmetic number, because the mean of its divisors is an integer number (290012354877).

Almost surely, 2^{1657213456420} is an apocalyptic number.

1657213456420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1657213456420 is an abundant number, since it is smaller than the sum of its proper divisors (1822934802104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1657213456420 is a wasteful number, since it uses less digits than its factorization.

1657213456420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82860672830 (or 82860672828 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 1657213456420 in words is "one trillion, six hundred fifty-seven billion, two hundred thirteen million, four hundred fifty-six thousand, four hundred twenty".