1642020657 has 16 divisors (see below), whose sum is σ = 2223593472. Its totient is φ = 1077587280.

The previous prime is 1642020649. The next prime is 1642020673. The reversal of 1642020657 is 7560202461.

It is not a de Polignac number, because 1642020657 - 2³ = 1642020649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1642020557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559528 + ... + 562454.

It is an arithmetic number, because the mean of its divisors is an integer number (138974592).

Almost surely, 2^1642020657 is an apocalyptic number.

It is an amenable number.

1642020657 is a deficient number, since it is larger than the sum of its proper divisors (581572815).

1642020657 is a wasteful number, since it uses less digits than its factorization.

1642020657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5788.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 1642020657 is about 40521.8540666638. The cubic root of 1642020657 is about 1179.7578400420.

The spelling of 1642020657 in words is "one billion, six hundred forty-two million, twenty thousand, six hundred fifty-seven".