642001755 has 16 divisors (see below), whose sum is σ = 1027625760. Its totient is φ = 342259968.

The previous prime is 642001747. The next prime is 642001771. The reversal of 642001755 is 557100246.

It is not a de Polignac number, because 642001755 - 2³ = 642001747 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36279 + ... + 50991.

It is an arithmetic number, because the mean of its divisors is an integer number (64226610).

Almost surely, 2^642001755 is an apocalyptic number.

642001755 is a deficient number, since it is larger than the sum of its proper divisors (385624005).

642001755 is a wasteful number, since it uses less digits than its factorization.

642001755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17630.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 642001755 is about 25337.7535507787. The cubic root of 642001755 is about 862.6714097468.

The spelling of 642001755 in words is "six hundred forty-two million, one thousand, seven hundred fifty-five".