664612564615 has 8 divisors (see below), whose sum is σ = 797559444000. Its totient is φ = 531673807392.

The previous prime is 664612564571. The next prime is 664612564621. The reversal of 664612564615 is 516465216466.

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

It is a cyclic number.

It is not a de Polignac number, because 664612564615 - 2³¹ = 662465080967 is a prime.

It is a super-2 number, since 2×664612564615² (a number of 24 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 7 ways as a sum of consecutive naturals, for example, 1849044 + ... + 2179033.

It is an arithmetic number, because the mean of its divisors is an integer number (99694930500).

Almost surely, 2^664612564615 is an apocalyptic number.

664612564615 is a deficient number, since it is larger than the sum of its proper divisors (132946879385).

664612564615 is a wasteful number, since it uses less digits than its factorization.

664612564615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061081.

The product of its digits is 6220800, while the sum is 52.

The spelling of 664612564615 in words is "six hundred sixty-four billion, six hundred twelve million, five hundred sixty-four thousand, six hundred fifteen".