642533157 has 48 divisors (see below), whose sum is σ = 1093755520. Its totient is φ = 355798656.

The previous prime is 642533137. The next prime is 642533183. The reversal of 642533157 is 751335246.

642533157 is a `hidden beast` number, since 642 + 5 + 3 + 3 + 1 + 5 + 7 = 666.

It is not a de Polignac number, because 642533157 - 2¹⁴ = 642516773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642533117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 869094 + ... + 869832.

Almost surely, 2^642533157 is an apocalyptic number.

It is an amenable number.

642533157 is a deficient number, since it is larger than the sum of its proper divisors (451222363).

642533157 is a wasteful number, since it uses less digits than its factorization.

642533157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1162 (or 1159 counting only the distinct ones).

The product of its digits is 75600, while the sum is 36.

The square root of 642533157 is about 25348.2377493979. The cubic root of 642533157 is about 862.9093628279.

The spelling of 642533157 in words is "six hundred forty-two million, five hundred thirty-three thousand, one hundred fifty-seven".