640148476517 has 6 divisors (see below), whose sum is σ = 703634275974. Its totient is φ = 581953160360.

The previous prime is 640148476493. The next prime is 640148476537. The reversal of 640148476517 is 715674841046.

It can be written as a sum of positive squares in only one way, i.e., 377547573601 + 262600902916 = 614449^2 + 512446^2 .

It is not a de Polignac number, because 640148476517 - 2¹² = 640148472421 is a prime.

It is a super-2 number, since 2×640148476517² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640148476537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2645241518 + ... + 2645241759.

It is an arithmetic number, because the mean of its divisors is an integer number (117272379329).

Almost surely, 2^640148476517 is an apocalyptic number.

It is an amenable number.

640148476517 is a deficient number, since it is larger than the sum of its proper divisors (63485799457).

640148476517 is a wasteful number, since it uses less digits than its factorization.

640148476517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5290483299 (or 5290483288 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 640148476517 in words is "six hundred forty billion, one hundred forty-eight million, four hundred seventy-six thousand, five hundred seventeen".