64661513542 has 8 divisors (see below), whose sum is σ = 101209325616. Its totient is φ = 30925071672.

The previous prime is 64661513537. The next prime is 64661513551. The reversal of 64661513542 is 24531516646.

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

It is a super-2 number, since 2×64661513542² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 702842493 + ... + 702842584.

It is an arithmetic number, because the mean of its divisors is an integer number (12651165702).

Almost surely, 2^64661513542 is an apocalyptic number.

64661513542 is a deficient number, since it is larger than the sum of its proper divisors (36547812074).

64661513542 is a wasteful number, since it uses less digits than its factorization.

64661513542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405685102.

The product of its digits is 518400, while the sum is 43.

The spelling of 64661513542 in words is "sixty-four billion, six hundred sixty-one million, five hundred thirteen thousand, five hundred forty-two".