2653406666388 has 18 divisors (see below), whose sum is σ = 6707222406794. Its totient is φ = 884468888784.

The previous prime is 2653406666369. The next prime is 2653406666437. The reversal of 2653406666388 is 8836666043562.

It can be written as a sum of positive squares in only one way, i.e., 1537991864964 + 1115414801424 = 1240158^2 + 1056132^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36852870331 + ... + 36852870402.

Almost surely, 2^{2653406666388} is an apocalyptic number.

It is an amenable number.

2653406666388 is an abundant number, since it is smaller than the sum of its proper divisors (4053815740406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2653406666388 is a wasteful number, since it uses less digits than its factorization.

2653406666388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73705740743 (or 73705740738 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 63.

The spelling of 2653406666388 in words is "two trillion, six hundred fifty-three billion, four hundred six million, six hundred sixty-six thousand, three hundred eighty-eight".