664817651542 has 8 divisors (see below), whose sum is σ = 1087883429832. Its totient is φ = 302189841600.

The previous prime is 664817651539. The next prime is 664817651549. The reversal of 664817651542 is 245156718466.

664817651542 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (664817651549) 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, 15109492059 + ... + 15109492102.

It is an arithmetic number, because the mean of its divisors is an integer number (135985428729).

Almost surely, 2^664817651542 is an apocalyptic number.

664817651542 is a deficient number, since it is larger than the sum of its proper divisors (423065778290).

664817651542 is a wasteful number, since it uses less digits than its factorization.

664817651542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30218984174.

The product of its digits is 9676800, while the sum is 55.

The spelling of 664817651542 in words is "six hundred sixty-four billion, eight hundred seventeen million, six hundred fifty-one thousand, five hundred forty-two".