64253525464661 has 16 divisors (see below), whose sum is σ = 69447345298800. Its totient is φ = 59095606053888.

The previous prime is 64253525464651. The next prime is 64253525464669. The reversal of 64253525464661 is 16646452535246.

It can be written as a sum of positive squares in 8 ways, for example, as 619241512561 + 63634283952100 = 786919^2 + 7977110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64253525464661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64253525464661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64253525464669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206069885 + ... + 206381453.

It is an arithmetic number, because the mean of its divisors is an integer number (4340459081175).

Almost surely, 2^{64253525464661} is an apocalyptic number.

It is an amenable number.

64253525464661 is a deficient number, since it is larger than the sum of its proper divisors (5193819834139).

64253525464661 is a wasteful number, since it uses less digits than its factorization.

64253525464661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369128.

The product of its digits is 124416000, while the sum is 59.

The spelling of 64253525464661 in words is "sixty-four trillion, two hundred fifty-three billion, five hundred twenty-five million, four hundred sixty-four thousand, six hundred sixty-one".