4001642257 has 6 divisors (see below), whose sum is σ = 4250879798. Its totient is φ = 3766251264.

The previous prime is 4001642251. The next prime is 4001642261. The reversal of 4001642257 is 7522461004.

It can be written as a sum of positive squares in 3 ways, for example, as 974001681 + 3027640576 = 31209^2 + 55024^2 .

It is not a de Polignac number, because 4001642257 - 2²⁷ = 3867424529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001642251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6922968 + ... + 6923545.

Almost surely, 2^4001642257 is an apocalyptic number.

It is an amenable number.

4001642257 is a deficient number, since it is larger than the sum of its proper divisors (249237541).

4001642257 is a wasteful number, since it uses less digits than its factorization.

4001642257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13846547 (or 13846530 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 4001642257 is about 63258.5350525919. The cubic root of 4001642257 is about 1587.6182656183.

The spelling of 4001642257 in words is "four billion, one million, six hundred forty-two thousand, two hundred fifty-seven".