1641402557657 has 8 divisors (see below), whose sum is σ = 1643931676800. Its totient is φ = 1638875106640.

The previous prime is 1641402557357. The next prime is 1641402557737. The reversal of 1641402557657 is 7567552041461.

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 1641402557657 - 2³² = 1637107590361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1641402557599 and 1641402557608.

It is not an unprimeable number, because it can be changed into a prime (1641402557357) 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, 1559648 + ... + 2390670.

It is an arithmetic number, because the mean of its divisors is an integer number (205491459600).

Almost surely, 2^{1641402557657} is an apocalyptic number.

It is an amenable number.

1641402557657 is a deficient number, since it is larger than the sum of its proper divisors (2529119143).

1641402557657 is an equidigital number, since it uses as much as digits as its factorization.

1641402557657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834063.

The product of its (nonzero) digits is 7056000, while the sum is 53.

The spelling of 1641402557657 in words is "one trillion, six hundred forty-one billion, four hundred two million, five hundred fifty-seven thousand, six hundred fifty-seven".