664838507542 has 8 divisors (see below), whose sum is σ = 1087917557832. Its totient is φ = 302199321600.

The previous prime is 664838507527. The next prime is 664838507549. The reversal of 664838507542 is 245705838466.

664838507542 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 a super-2 number, since 2×664838507542² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664838507549) 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, 15109966059 + ... + 15109966102.

It is an arithmetic number, because the mean of its divisors is an integer number (135989694729).

Almost surely, 2^664838507542 is an apocalyptic number.

664838507542 is a deficient number, since it is larger than the sum of its proper divisors (423079050290).

664838507542 is a wasteful number, since it uses less digits than its factorization.

664838507542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30219932174.

The product of its (nonzero) digits is 38707200, while the sum is 58.

The spelling of 664838507542 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, five hundred seven thousand, five hundred forty-two".