651256040605 has 4 divisors (see below), whose sum is σ = 781507248732. Its totient is φ = 521004832480.

The previous prime is 651256040581. The next prime is 651256040627. The reversal of 651256040605 is 506040652156.

651256040605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104724079321 + 546531961284 = 323611^2 + 739278^2 .

It is not a de Polignac number, because 651256040605 - 2⁵ = 651256040573 is a prime.

It is a super-3 number, since 3×651256040605³ (a number of 36 digits) contains 333 as substring.

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, 65125604056 + ... + 65125604065.

It is an arithmetic number, because the mean of its divisors is an integer number (195376812183).

Almost surely, 2^651256040605 is an apocalyptic number.

It is an amenable number.

651256040605 is a deficient number, since it is larger than the sum of its proper divisors (130251208127).

651256040605 is a wasteful number, since it uses less digits than its factorization.

651256040605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130251208126.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 651256040605 in words is "six hundred fifty-one billion, two hundred fifty-six million, forty thousand, six hundred five".