664102415 has 4 divisors (see below), whose sum is σ = 796922904. Its totient is φ = 531281928.

The previous prime is 664102409. The next prime is 664102423. The reversal of 664102415 is 514201466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 514201466 = 2 ⋅257100733.

It is a cyclic number.

It is not a de Polignac number, because 664102415 - 2¹⁰ = 664101391 is a prime.

It is a Duffinian number.

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, 66410237 + ... + 66410246.

It is an arithmetic number, because the mean of its divisors is an integer number (199230726).

Almost surely, 2^664102415 is an apocalyptic number.

664102415 is a deficient number, since it is larger than the sum of its proper divisors (132820489).

664102415 is a wasteful number, since it uses less digits than its factorization.

664102415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132820488.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 664102415 is about 25770.1846132308. The cubic root of 664102415 is about 872.4589855461.

The spelling of 664102415 in words is "six hundred sixty-four million, one hundred two thousand, four hundred fifteen".