642025157 has 4 divisors (see below), whose sum is σ = 642402540. Its totient is φ = 641647776.

The previous prime is 642025141. The next prime is 642025177. The reversal of 642025157 is 751520246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 281367076 + 360658081 = 16774^2 + 18991^2 .

It is a cyclic number.

It is not a de Polignac number, because 642025157 - 2⁴ = 642025141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642025117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186128 + ... + 189545.

It is an arithmetic number, because the mean of its divisors is an integer number (160600635).

Almost surely, 2^642025157 is an apocalyptic number.

It is an amenable number.

642025157 is a deficient number, since it is larger than the sum of its proper divisors (377383).

642025157 is a wasteful number, since it uses less digits than its factorization.

642025157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377382.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 642025157 is about 25338.2153475733. The cubic root of 642025157 is about 862.6818915411.

The spelling of 642025157 in words is "six hundred forty-two million, twenty-five thousand, one hundred fifty-seven".