642577066 has 8 divisors (see below), whose sum is σ = 966409920. Its totient is φ = 320440428.

The previous prime is 642577057. The next prime is 642577087. The reversal of 642577066 is 660775246.

642577066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423106 + ... + 424621.

It is an arithmetic number, because the mean of its divisors is an integer number (120801240).

Almost surely, 2^642577066 is an apocalyptic number.

642577066 is a deficient number, since it is larger than the sum of its proper divisors (323832854).

642577066 is a wasteful number, since it uses less digits than its factorization.

642577066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848108.

The product of its (nonzero) digits is 423360, while the sum is 43.

The square root of 642577066 is about 25349.1038500378. The cubic root of 642577066 is about 862.9290186873.

The spelling of 642577066 in words is "six hundred forty-two million, five hundred seventy-seven thousand, sixty-six".